I change few stream.ini parameters
From:
memory 13500
devkit_memory 13500
vehicles 12
pe_lightchangerate 0.0005
pe_lightingbasecap 0.35
pe_lightingbasemult 0.5
pe_leftx 16
pe_topy 16
pe_rightx 16
pe_bottomy 16
dontbuildpaths
to
memory 99999
devkit_memory 99999
vehicles 20
pe_lightchangerate 0.0005
pe_lightingbasecap 0.35
pe_lightingbasemult 0.5
pe_leftx 16
pe_topy 16
pe_rightx 16
pe_bottomy 16
dontbuildpaths


changing memory and devkit_memory from 13500 to 99999 reduced lag significantly