Hey, First, I'm really sad that I have to make this thread . I had a pretty smooth transition from windows to SL - only a tiny bug but that was about it. My experience with SL was fantastic even though I noticed people were complaining about it. But sadly I cannot say the same for Lion I decided to upgrade to lion yesterday after seeing how my friends were loving it. I did a clean install; it didn't look too flashy. I liked few new features but that's about it. It could be because I'm not yet aware of all the cool changes. The new gestures didn't get on my good side. But I guess I will get used to these new things eventually and start liking them. After-all I have explored Lion for only few hours after installing it yesterday, who knows what more good or bad stuff it got for me . Big issues I'm facing so far: 1 - My laptop is super duper hot even with fan control running at 6000rpm. I hit 74C couple of minutes ago with just browsing this forum. I am constantly hitting 60C+ with basic little things. With SL, I used to have 65-75C when playing a game on VM or 60-65C when constantly running flash on a browser. 2 - I barely have any free memory (4GB in total) when only few applications are opened: firefox, text editor, terminal, mail. So this is slowing down my system when I try to open more applications to do some dev work. Not sure what is the problem. With SL the only time I used to have 2GB+ active memory was again when playing a game on VM or running flash on browser for hours. 3 - After clean install, I restored folders to root (Macintosh HD) using time machine. As far folders under username (i.e., desktop, pictures etc), I had to do it manually. Now I'm having permission issues when writing to these folders. I was able to fix the permission on folders under my username but the root folders still seem to be giving me trouble even though I assigned read & write permission to group "everyone" for these folders. I cannot rename them or delete them without system asking me to enter admin password. Even creating a separate new folder directly under root asks me admin password. I'm not sure whether this is the default behaviour of Lion or there's a work around it. Any input or help would be much appreciated. Thanking in advance!