Lag in GTA Undegraund (Grand Theft Auto: San Andreas)

I'm a fan of GTA San Andreas I want to ask . when I install mod GTA undegraund . after starting the game , I feel discomfort when moving from the region of the San Andreas fault in any other island , for example liberty city . the discomfort that I have much prosidaet FPS to 20 . in the game impossible to play . everything slows down and the physics of transport is changing to such an extent that the feeling that I'm going on the train which slowly goes off the rails . I have a weak P. K. , and the limit frame is disabled . please advise a mod that removes friezes . and then all
the mods that removed the friezes that I installed broke the game . I think the freezes are related to the fact that the game program the state of SAN Andreas always . and when I go to town which is connected only when I fly up to him . the game starts wildly freesite .