Revive load delays slowing down Wordpress sites

[Matt Peskett]

Been using Revive (OpenX) for 15 years, had it installed on at least five different servers in that time and never had any performance issues, until now. It's hosted alongside three Wordpress magazine sites on a box, not particularly high traffic sites (maybe peaks of 30 people a minute across all three sites) but they keep timing out, 502s etc. The problem stops and they return to their normal lightning speed delivery when I deactivate the Revive domain (and all their banner ads). Only started 4 weeks ago, not sure why - has anybody come across similar issues? What sort of things can be done to optimise performance and reduce PHP overheads, it's not a memory issue (2GB used of 16Gb available).

Cheers