Общая: https://www.modpagespeed.com/
Установка на Nginx: https://modpagespeed.com/doc/build_ngx_pagespeed_from_source
Фильтры: https://www.modpagespeed.com/doc/config_filters#level
Nginx
# Основное домен для изображений
server {
server_name domain.com;
}
При ImageRecompressionQuality = 50 % примеры для jpg
517 800 –> 156 949 Качество на странице сайта – плохое.
# Отдельный домен для изображений
server {
server_name i.domain.com;
# ВКЛЮЧАЕМ
pagespeed on;
# Путь к каталогу кэша
pagespeed FileCachePath /tmpfs/ngx_pagespeed_cache/i.domain.com/;
# Максимальный размер кэша - 1ГБ
pagespeed FileCacheSizeKb 1024000;
# Интервал для очистки кэша - 7 дней
pagespeed FileCacheCleanIntervalMs 650000000;
pagespeed EnableFilters rewrite_images;
pagespeed ImageRecompressionQuality 50;
...
}
Контроль
Добавляем к URL /?PageSpeedFilters=+debug
В результирующем коде страницы смотрим:
<!-- mod_pagespeed on Filters: ah Add Head cw Collapse Whitespace cc Combine Css jc Combine Javascript gp Convert Gif to Png jp Convert Jpeg to Progressive jw Convert Jpeg To Webp mc Convert Meta Tags pj Convert Png to Jpeg ws When converting images to WebP, prefer lossless conversions db Debug ec Cache Extend Css ei Cache Extend Images es Cache Extend Scripts fc Fallback Rewrite Css if Flatten CSS Imports hw Flushes html ci Inline Css ii Inline Images il Inline @import to Link ji Inline Javascript js Jpeg Subsampling rj Recompress Jpeg rp Recompress Png rw Recompress Webp rc Remove Comments ri Resize Images cf Rewrite Css jm Rewrite External Javascript jj Rewrite Inline Javascript cu Rewrite Style Attributes With Url cp Strip Image Color Profiles md Strip Image Meta Data Options: AvoidRenamingIntrospectiveJavascript (aris) True EnableRewriting (e) 1 FileCacheCleanIntervalMs (afcci) 1800000 FileCacheInodeLimit (afcl) 500000 FileCacheSizeKb (afc) 712000 RewriteLevel (l) Core Filters #NumFlushes 2 #EndDocument after 36321us #Total Parse duration 10397us #Total Render duration 26180us #Total Idle duration 3704us Critical Images: https://i.domain.com/2015/05_13/11_46/files_topic_2_774.png https://i.domain.com/2015/05_13/11_49/files_topic_2_776.png https://i.domain.com/2015/05_13/11_50/files_topic_2_777.png https://i.domain.com/2015/05_13/11_52/files_topic_2_778.png https://i.domain.com/2015/05_13/11_52/files_topic_2_779.png https://i.domain.com/2015/05_13/11_53/files_topic_2_780.png https://i.domain.com/2015/05_19/00_37/files_topic_1_808.png https://i.domain.com/2015/06_01/19_42/files_topic_1_819.png https://i.domain.com/2015/09_18/17_37/files_topic_3_1195.png https://i.domain.com/2017/05_30/11_17/files_topic_3_3273.jpg https://i.domain.com/2017/09_01/15_18/files_topic_1_3375.jpg The following filters were disabled for this request: SupportNoscript -->