Lofesa commented on issue #1685: Pagespeed causes high FTTB on nginx URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1685#issuecomment-612999657 As far as I know w/ RewriteLevel PassThrough only explicit enabled filters works, and you have none enabled. Whats filters have you enabled in the url? In other hand when you set PageSpeed=off the "original" headers are used, so if you have cache-control in place, the url is stored in the proxy cache, but when you have PageSpeed=on, cache-control header is set to max-age=0 and is not stored in the proxy cache. But the 16ms/676ms are not the TTFB, these are total time for these url. For a better measure of TTFB you can use some tool like https://www.webpagetest.org/ and see what this tools say in the First Byte
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