WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: Anything in 4.9.2 that could cause MASSIVE slowdown – time to first byte?, by rossagrant Thanks for taking a look Steve. The TTFB seen there is due to the fact the site serves cached files to non-logged in members. It’s a fair bit slower when serving to logged-in users. It’s so weird though – doesn’t seem to be all the time. There were some php updates on the server a couple of nights back, so it could be those – but in general the server is still fast, until it is serving WP pages. That’s what made me think something in 4.9.2 could be a cause. I’ve seen a couple of people post that their site was slower after 4.9.2. Any ideas would be greatly appreciated. Thanks! Reply To: Anything in 4.9.2 that could cause MASSIVE slowdown – time to first byte?