When I had the X I only ran stock froyo for the first few weeks, and it sucked. Then I went to apex and it was much better and then to liberty which was the best. After I gave it to my wife I put it back to stock with root and autokiller and I was really surprised at how fast it was, then I put ApeX 1.4.1 an it lags a bit and browsing is slower than stock, so I reinstalled it a few times and each time it was the same. The only reason Ihaven't put Liberty on it for her is because she really likes the blur dialer.