Ofc I won't update while its in beta, just asking for people's experience with 4.1 generally , did anyone test it thoroughly, is there really some performance and overall boost ? I had 4.0 on live site, was good first week, after that performance hit from time to time was awful, plus lot of small bugs, posting youtube links was really buggy. And there isn't much themes for 4.x as well, skiners are telling coding in 4.x is a mess. Doing little research for skins,mods etc for guild website , not yet sure to concentrate on 3.4 or 4.x. Maybe 4.x is flashy but atm 3.4 looks safer and more stable. I already think 4 has a general performance boost over 3, further updates to the system will only make this better. Ofcourse serverside performance tweaking and smart use of caching will help you lots too. I've not experienced performance degradations on WebFlake after we started using 4.x myself. However, if you're comfortable on 3.4 and you have everything in place the way it is and there's absolutely no reason to upgrade other than "being on the latest version" i don't see why you shouldn't stick with your safe, stable and working system.