Common devices are:
1. HTC One X, ROM Android Revolution HD 22 (4.1.1) - Browsers: Stock and Chrome - Delay while typing.
2. Samsung Galaxy S2 Android 4.0.3 (No custom ROM) - Browsers: Stock and Firefox - Delay while typing + a problem going down a line (doesn't respond).
Both devices were also checked on Xenforo.com to confirm the problem.
Is there anything that can be done to solve it?