You can configure all parameters to your liking in the XtremeTool.ini.
All memory values are specified in Mega Bytes (MB) so keep that in mind.


Parameters Overview:

PED_SPAWN_AMBIENT_MULTIPLIER

Multiplies the amount of ambient (strolling) peds that should walk around in the game world.

PED_SPAWN_SCENARIO_MULTIPLIER

Multiplies the amount of peds that are in a scenario (e.g smoking, using a phone, sitting).

VEH_SPAWN_AMBIENT_MULTIPLIER

Multiplies the amount of ambient (randomly driving) vehicles that should drive around in the game world.

VEH_SPAWN_PARKED_MULTIPLIER

Multiplies the amount of parked vehicles.

USE_64BIT_HEAP_SIZE

Whether to allow a main heap size that exceeds 32 bit (e.g 4000 MB => 4194304000 Bytes).

HEAP_SIZE

The size of the main heap.

USE_64BIT_POOL_SIZE

Whether to allow a pool heap size that exceeds 32 bit.

POOL_SIZE

The size of the pool heap. It is a sub heap of the main heap so make sure that it is SMALLER than the main heap. This heap is used to allocate pools such as the ones that can be configured in the gameconfig.xml.

USE_64BIT_RESOURCE_SIZE

Whether to allow a resource heap size that exceeds 32 bit.

RESOURCE_SIZE

The size of the resource heap. This heap is used to store loaded disk information and other physical data. It is independent of the main heap.

PED_MEM_SIZE

The memory budget that can be used to stream ped models into the world. Note that increasing it consumes RAM *and* VRAM.

VEH_MEM_SIZE

The memory budget that can be used to stream vehicle models into the world. Note that increasing it consumes RAM *and* VRAM.

PED_LIMIT

Modifies the ped pool size and makes all necessary changes to the engine to make pools > 256 possible.

VEH_LIMIT

Modifies the vehicle pool size.

SKIP_PEDS_PATHFIND_PASS

Whether to skip internal path finding when searching for spawn positions. Keep this turned on if you want large crowds to spawn.