apparently , they found a performance problem AFTER who knows how long it was in testlive.
maybe, testlive servers are not the same as live ones , otherwise someone would have noticed. or maybe testlive servers were deserted , and they (funcom) were unable to find the issue until it hit live servers…
if a problem was found, and the patch just went to xbox and ps4, it also means, this platforms are going to kept themselves with issues , during their internal validation process. (could take days)
i know this is a touchy subject, but UPDATES should always go first to PC, before consoles, (due to the complexity and time needed to validate and apply new patches. ) , or you could potentially find yourself with a problem in your game for several days , while it clears the validation process (a process that does not exist in consoles) -just my 2 cents-