1) Some people suggest to change the used CPU governor from PegasusQ to ondemand.
While this actually helps to reduce the lag, it is a very bad idea. Ondemand is a generic governor in the linux kernel and does not support CPU Hotplugging. This will result in either a way to big battery drain since the cores will tend to run at full speed most the time, even in idle situations or severe lags.
2) Samsung introduced in the JB 4.2.1 , 4.2.2 and now 4.3 Firmware the usage of zRAM to his kernel.3) Use an alternative kernel: Samsung has released the required kernel sources for JB 4.3 very fast this time.http://yank555-lu.net/viewtopic.php?p=3#p3http://download.chainfire.eu/345/