Nginx PageSpeed Nginx Pagespeed - ngx_pagespeed module

A major addition to the Centmin Mod Nginx configuration is Nginx Pagespeed - ngx_pagespeed module as outlined at http://centminmod.com/nginx_ngx_pagespeed.html.

There's just so much information, it's best to read it from the beginning from above linked page.

Brief info listed below.

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Google recently announced the release of Nginx Pagespeed, ngx_pagespeed module - the Nginx equivalent to Apache's mod_pagespeed. Reminder, it's still a beta release, so be sure to keep up to date with Nginx Pagespeed bugs and issues as well 'Using the PageSpeed Module' guide.

1. What is ngx_pagespeed and why install the module ?
2. Google I/O 2013 - Video
3. Introduction to ngx_pagespeed on Centmin Mod
4. How to install and configure ngx_pagespeed on Centmin Mod Nginx ?
5. How to exclude specific urls, files, directories from ngx_pagespeed ? (added May 3rd, 2014)
6. How to disable ngx_pagespeed integration in Centmin Mod Nginx ?
7. How to upgrade ngx_pagespeed on Centmin Mod ?
8. ngx_pagespeed config files
9. ngx_pagespeed statistics page
10. ngx_pagespeed PageSpeed Console (added July 18th, 2013)

What is ngx_pagespeed and why install the module ?

Google I/O 2013 - Video

Ilya Grigorik presentation video at Google I/O 2013 explaing Google Pagespeed - Automating Performance Best Practices with PageSpeed. If after watching that video, you get the itch to test your own web site's PageSpeed scores, check out one of my blog articles titled - Web site page loading speed optimization online tools & tests, which lists a number of online page speed and analysis tools - many I use myself.



Introduction to ngx_pagespeed on Centmin Mod

I decided to add ngx_pagespeed module support to Centmin Mod v1.2.3-eva2000.01 beta release. There are 4 variables in centmin.sh which controls whether ngx_pagespeed module support is added:

• NGINX_PAGESPEEDGITMASTER=y. Setting to yes will override the below variable's version number and grab the lastest master source repository fromhttps://github.com/pagespeed/ngx_pagespeed. This setting was added as some specific version builds had bugs which were not fixed in the specific version but were fixed in master repository. Setting this to yes would allow you to get the latest fixes which don't exist in version specific versions. If you have this set to yes and Nginx fails to compile, it could be a bug in master repository, so set it to no NGINX_PAGESPEEDGITMASTER=n and specify a specific version below and re-run centmin.sh menu option #4 to recompile Nginx
• NGINX_PAGESPEED=y. Setting NGINX_PAGESPEED=n will disable ngx_pagespeed module when you next run Nginx upgrade via menu option #4.
• NGXPGSPEED_VER='1.7.30.4-beta' - sets the ngx_pagespeed version to install
• NGINX_PAGESPEEDPSOL_VER='1.7.30.4' - sets the Pagespeed Optimization Library version - which as of ngx_pagespeed 1.5.27.3 beta is no longer included with main ngx_pagespeed module download.

While ngx_pagespeed module is installed, the default ngx_pagespeed state is turned off. After ngx_pagespeed module is added to Nginx, you'll need to enable it via Centmin Mod command line shortcut within SSH telnet type:

Code:

pscontrol on

To turn off ngx_pagespeed:

Code:

pscontrol off

 

moved forum's pagespeed.conf to dedicated thread at http://community.centminmod.com/threads/this-forums-pagespeed-conf.62/

 

ngx_pagespeed 1.8.31-2 beta global pagespeed admin (/pagespeed_global_admin/) and console stats can be enabled same way as outlined at http://centminmod.com/nginx_ngx_pagespeed.html#pagespeedconsole

i.e.

Code:

timestamp_:                                            1401007809749
cache_time_us:                                               1351875
cache_hits:                                                     2883
cache_misses:                                                    398
cache_backend_hits:                                             3189
cache_backend_misses:                                             92
cache_fallbacks:                                                   3
cache_expirations:                                               148
cache_inserts:                                                   468
cache_deletes:                                                     0
instrumentation_filter_script_added_count:                         0
cache_extensions:                                                711
not_cacheable:                                                     0
critical_css_beacon_filter_script_added_count:                   240
critical_css_no_beacon_due_to_missing_data:                        0
critical_css_skipped_due_to_charset:                               0
critical_images_beacon_filter_script_added_count:                318
css_combine_opportunities:                                       895
css_file_count_reduction:                                        306
css_filter_blocks_rewritten:                                     166
css_filter_parse_failures:                                         0
css_filter_fallback_rewrites:                                      0
css_filter_fallback_failures:                                      0
css_filter_rewrites_dropped:                                       0
css_filter_total_bytes_saved:                                 220030
css_filter_total_original_bytes:                            10019598
css_filter_uses:                                                1673
flatten_imports_charset_mismatch:                                  0
flatten_imports_invalid_url:                                       0
flatten_imports_limit_exceeded:                                  110
flatten_imports_minify_failed:                                     0
flatten_imports_recursion:                                         0
flatten_imports_complex_queries:                                   0
num_css_inlined:                                                 432
css_imports_to_links:                                              0
css_elements_moved:                                               71
num_css_used_for_critical_css_computation:                       740
num_css_not_used_for_critical_css_computation:                  1125
num_dedup_inlined_images_candidates_found:                         0
num_dedup_inlined_images_candidates_replaced:                      0
domain_rewrites:                                                   0
google_analytics_page_load_count:                                  0
google_analytics_rewritten_count:                                  0
font_service_input_resource_hit:                                   0
font_service_input_resource_recent_fetch_failure:                  0
font_service_input_resource_recent_uncacheable_treated_as_miss:    0
font_service_input_resource_recent_uncacheable_treated_as_failure: 0
font_service_input_resource_miss:                                  4
image_file_count_reduction:                                        0
image_rewrites:                                                   46
image_resized_using_rendered_dimensions:                           0
image_norewrites_high_resolution:                                  0
image_rewrites_dropped_intentionally:                              6
image_rewrites_dropped_decode_failure:                             0
image_rewrites_dropped_mime_type_unknown:                          0
image_rewrites_dropped_server_write_fail:                          0
image_rewrites_dropped_nosaving_resize:                            0
image_rewrites_dropped_nosaving_noresize:                          6
image_rewrites_dropped_due_to_load:                                0
image_rewrites_squashing_for_mobile_screen:                        0
image_rewrite_total_bytes_saved:                               61224
image_rewrite_total_original_bytes:                           104248
image_rewrite_uses:                                             5539
image_inline:                                                   2023
image_webp_rewrites:                                              45
image_rewrite_latency_total_ms:                                  160
image_ongoing_rewrites:                                            0
image_webp_conversion_gif_timeouts:                                0
image_webp_conversion_png_timeouts:                                0
image_webp_conversion_jpeg_timeouts:                               0
image_webp_alpha_timeouts:                                         0
image_webp_opaque_timeouts:                                        0
in_place_oversized_opt_stream:                                     0
in_place_uncacheable_rewrites:                                     0
inserted_ga_snippets:                                              0
javascript_blocks_minified:                                     1643
javascript_libraries_identified:                                   0
javascript_minification_failures:                                  0
javascript_total_bytes_saved:                                 150494
javascript_total_original_bytes:                             3317585
javascript_minify_uses:                                         1645
javascript_reducing_minifications:                              1637
javascript_minification_disabled:                                  0
javascript_did_not_shrink:                                         1
javascript_failed_to_write:                                        0
js_file_count_reduction:                                        1088
num_js_inlined:                                                   64
num_local_storage_cache_candidates_found:                          0
num_local_storage_cache_stored_total:                              0
num_local_storage_cache_stored_images:                             0
num_local_storage_cache_stored_css:                                0
num_local_storage_cache_candidates_added:                          0
num_local_storage_cache_candidates_removed:                        0
converted_meta_tags:                                             465
split_html_beacon_filter_script_added_count:                       0
num_rewrites_abandoned_for_lock_contention:                        0
num_distributed_rewrite_successes:                                 0
num_distributed_rewrite_failures:                                  0
num_distributed_metadata_failures:                                 0
num_deadline_alarm_invocations:                                    0
url_input_resource_hit:                                          362
url_input_resource_recent_fetch_failure:                         158
url_input_resource_recent_uncacheable_treated_as_miss:             0
url_input_resource_recent_uncacheable_treated_as_failure:          0
url_input_resource_miss:                                         236
url_trims:                                                         0
url_trim_saved_bytes:                                              0
resource_url_domain_acceptances:                               22468
resource_url_domain_rejections:                                 7029
rewrite_cached_output_missed_deadline:                          1251
rewrite_cached_output_hits:                                    15801
rewrite_cached_output_misses:                                   1611
resource_404_count:                                             4505
slurp_404_count:                                                   0
total_page_load_ms:                                                0
page_load_count:                                                   0
resource_fetches_cached:                                        2521
resource_fetch_construct_successes:                              115
resource_fetch_construct_failures:                                 0
num_cache_control_rewritable_resources:                          924
num_cache_control_not_rewritable_resources:                      311
num_flushes:                                                     482
num_fallback_responses_served:                                     0
num_proactively_freshen_user_facing_request:                       0
num_fallback_responses_served_while_revalidate:                    0
num_conditional_refreshes:                                         0
ipro_served:                                                       0
ipro_not_in_cache:                                                 0
ipro_not_rewritable:                                               0
downstream_cache_purge_attempts:                                   0
successful_downstream_cache_purges:                                0
total_fetch_count:                                              2510
total_rewrite_count:                                             482
num_rewrites_executed:                                           792
num_rewrites_dropped:                                              0
num_resource_fetch_successes:                                     87
num_resource_fetch_failures:                                     153
html-worker-queue-depth:                                           0
rewrite-worker-queue-depth:                                        0
low-priority-worked-queue-depth:                                   0
cache_batcher_dropped_gets:                                        0
critical_images_valid_count:                                     373
critical_images_expired_count:                                    34
critical_images_not_found_count:                                  75
critical_css_valid_count:                                          0
critical_css_expired_count:                                        0
critical_css_not_found_count:                                      0
critical_selectors_valid_count:                                  337
critical_selectors_expired_count:                                 35
critical_selectors_not_found_count:                              105
serf_fetch_request_count:                                        240
serf_fetch_bytes_count:                                      2187548
serf_fetch_time_duration_ms:                                     345
serf_fetch_cancel_count:                                           0
serf_fetch_active_count:                                           0
serf_fetch_timeout_count:                                          0
serf_fetch_failure_count:                                          0
serf_fetch_cert_errors:                                            0
memcache_timeouts:                                                 0
memcache_last_error_checkpoint_ms:                     1401003355791
memcache_error_burst_size:                                         0
file_cache_bytes_freed_in_cleanup:                                 0
file_cache_cleanups:                                               0
file_cache_disk_checks:                                            3
file_cache_evictions:                                              0
file_cache_write_errors:                                           0
file_cache_deletes:                                                0
file_cache_hits:                                                  10
file_cache_inserts:                                                6
file_cache_misses:                                                 5
lru_cache_deletes:                                                 0
lru_cache_hits:                                                    0
lru_cache_inserts:                                                 0
lru_cache_misses:                                                  0
shm_cache_deletes:                                                 0
shm_cache_hits:                                                12126
shm_cache_inserts:                                              1576
shm_cache_misses:                                               1461
memcached_async_deletes:                                           0
memcached_async_hits:                                           3372
memcached_async_inserts:                                        1857
memcached_async_misses:                                         1366
memcached_blocking_deletes:                                        0
memcached_blocking_hits:                                        1009
memcached_blocking_inserts:                                     1369
memcached_blocking_misses:                                       914
compressed_cache_corrupt_payloads:                                 0
compressed_cache_original_size:                                    0
compressed_cache_compressed_size:                                  0
pcache-cohorts-beacon_cohort_deletes:                              0
pcache-cohorts-beacon_cohort_hits:                               787
pcache-cohorts-beacon_cohort_inserts:                           1080
pcache-cohorts-beacon_cohort_misses:                             370
pcache-cohorts-dom_deletes:                                        0
pcache-cohorts-dom_hits:                                         228
pcache-cohorts-dom_inserts:                                      295
pcache-cohorts-dom_misses:                                       549
ipro_recorder_resources:                                           0
ipro_recorder_inserted_into_cache:                                 0
ipro_recorder_not_cacheable:                                       0
ipro_recorder_failed:                                              0
ipro_recorder_dropped_due_to_load:                                 0
ipro_recorder_dropped_due_to_size:                                 0
current-fetch-queue-size:                                          0
queued-fetch-count:                                               33
dropped-fetch-count:                                               0
child_shutdown_count:                                              0
cache_flush_count:                                                 0
cache_flush_timestamp_ms:                                          0
statistics_404_count:                                              0
http_fetches:                                                      0
http_bytes_fetched:                                                0
http_approx_header_bytes_fetched:                                  0

PageSpeed console

 

cheers dedicated thread discussion at Nginx PageSpeed - ngx_pagespeed 1.9.32.2 beta released | Centmin Mod Community

 

no free lunch, ngx_pagespeed's ability to load pages faster does consume resources just like varnish cache, fastcgi_cache, redis cache, memcached caching all cache and improve performance by using memory

memory usage might come down a bit if you use ngx_pagespeed as a nginx dynamic module in 123.09beta01

with persistent config file /etc/centminmod/custom_config.inc setup for

Code (Text):

NGXDYNAMIC_NGXPAGESPEED=y
NGINX_PAGESPEED=y

 

but that is the latest version in centmin.sh and on ngx_pagespeed git repo Releases · pagespeed/ngx_pagespeed · GitHub

 

yeah google detection seems a bit delayed or inaccurate if you've enabled in pagespeed.conf the XHeaderValue to mask the version number

Code (Text):

#######################################################
# By default, ngx_pagespeed adds an X-PageSpeed header with a value of the version of
# ngx_pagespeed being used. This directive lets you specify the value to use instead:
# pagespeed XHeaderValue "ngx_pagespeed";