Gaming eats major performance. Phone is benchmarked on video play for 5hours. 3-5 hours on purely gaming is pretty much expected, every phone is supposed to behave that way, including a Galaxy S4 which is slightly about 6 hours.
Regarding overheating and stuff, I'd recommend you shift to a custom rom so alot of bloatware which eats background CPU power gets removed and you get neat android experience. This phone is alot cooler than my Atrix 4G / LG Nitro HD or even my good chinese craplet Ainol Novo 7 Elf II .
I kept stock rom for barely 3 hours on mine Optimus 4G (which I spent waiting on downloads to convert my phone to e975 from F180 and installing custom recovery / rom blabla)
Originally Posted by seba2121
IF i gaming in GTA SA and charging (with oc GPU 487 and 1.8Ghz ) my temperature is 75-85°C
Wysłane z mojego LG-E975 przy użyciu Tapatalka
lol thats too much extra juice you are spilling for a lesser resource hungry game as GTA SA. You will do fine on a stock 3.4 kernel. There is a reason why manufacturer clocks and sets up hardware.