Because posting in someone else's thread where they are asking for help with their specific issues with comments like "I'm having the same problem!" with no confirmation, logs, or understanding of what's going on is incredibly rude to the original poster who is asking for help. Make a new post. Include a log, as the forums say to all over the place. It gets REALLY tiring when people post "me too me too!" and then everyone assumes there's some larger issue with OBS when it's not, at all.
All of the recent performance related issues have not been the update itself, but rather a combination of terrible antivirus, Windows 10 updates, or other external factors to OBS itself. If there actually is a performance issue on the newer version (which is EXTREMELY unlikely given that none of the code that was updated has anything to do with the actual encoding side of things), we have yet to see any real evidence of that fact. We take these reports very seriously, but please understand that we get hundreds of reports of people doing really, really stupid things with the program through ignorance every single day. Core i3 CPU? 1080p60fps at veryslow x264 preset? Yeah, not gonna work so well, and when they say it's always worked in the past, we know there's a missing piece of their story.
I understand that their perception is "Must be the program, I can't be the reason this isn't working!" but that's almost always the case, and when it's not, it's external interference.