Here's a solution to make it run faster and with less lag. If you checked this topic, you are probably on a low-end machine, just like me. Just do the following:
1) Go to your SA folder. (default C:\Program Files\Rockstar Games\GTA San Andreas)
2) Find a configuration file named "stream".
3) Delete all of the text, and type the following.
memory 250000 devkit_memory 250000 vehicles 12 peds 15 people 30 pe_lightchangerate 0.0005 pe_lightingbasecap 0.38 pe_lightingbasemult 0.53 pe_leftx 120 pe_topy 120 pe_rightx 120 pe_bottomy 120 dontbuildpaths