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Posted to dev@pagespeed.apache.org by GitBox <gi...@apache.org> on 2020/04/13 12:04:00 UTC
[GitHub] [incubator-pagespeed-ngx] ShadowXVII commented on issue #1685:
Pagespeed causes high FTTB on nginx
ShadowXVII commented on issue #1685: Pagespeed causes high FTTB on nginx
URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1685#issuecomment-612871452
Sorry, I know it's a very vague question! I'll try and get some more metrics.
The pagespeed is on a disk, with a redis cache also.
The proxy type is Azure Front Door which is Microsoft's CDN network. I have unique query URLs cached -- it should also respect cache headers from source. Maybe the two aren't interacting well together.
Switching pagespeed off and on using the URL parameters causes a difference:
The timings when debug is enabled are as follows:
```<!--
mod_pagespeed on
Filters:
db Debug
hw Flushes html
Options:
AvoidRenamingIntrospectiveJavascript (aris) True
EnableCachePurge (euci) True
EnableRewriting (e) 1
FileCacheCleanIntervalMs (afcci) 86400000
FileCacheInodeLimit (afcl) 500000
FileCacheSizeKb (afc) 2048000
RewriteLevel (l) Pass Through
Statistics (ase) True
StatisticsLogging (asle) True
#NumFlushes 0
#EndDocument after 216021us
#Total Parse duration 2208us
#Total Render duration 695us
#Total Idle duration 213813us
The following filters were disabled for this request:
SupportNoscript
-->```
The config is currently as follows
```
# pagespeed
pagespeed standby;
pagespeed FileCachePath "/var/cache/pagespeed/";
pagespeed FileCacheSizeKb 2048000;
pagespeed FileCacheCleanIntervalMs 86400000;
pagespeed FileCacheInodeLimit 500000;
pagespeed RedisServer "localhost:6379";
pagespeed RewriteLevel PassThrough;
pagespeed DisableFilters "rewrite_images,resize_images";
pagespeed Statistics on;
pagespeed StatisticsLogging on;
pagespeed LogDir /var/log/pagespeed;
pagespeed AdminPath /pagespeed_admin;
pagespeed EnableCachePurge on;
pagespeed PurgeMethod PURGE;
```
So if I interpret those stats correctly, the long Idle duration suggests the FTTB is mostly caused by the underlying page?
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