Begins to frezite - lag after 20 - 30 minutes. (Grand Theft Auto 5)

Before that I played 2 months ago and everything was OK. two months Later the only change is the speed of the Internet due to the fact that I moved to the country, and there the Internet is much slower than in the city. Tried literally everything they saw and disk Defragmenter and lowered the settings and set the swap file, that only have not tried, please help!