You can detect someones FPS in sa-mp easily my friend.
stock GetPlayerFPS(playerid)
{
SetPVarInt(playerid, "DrunkL", GetPlayerDrunkLevel(playerid));
if(GetPVarInt(playerid, "DrunkL") < 100) SetPlayerDrunkLevel(playerid, 2000);
else {
if(GetPVarInt(playerid, "LDrunkL") != GetPVarInt(playerid, "DrunkL")) {
SetPVarInt(playerid, "FPS", (GetPVarInt(playerid, "LDrunkL") - GetPVarInt(playerid, "DrunkL")));
SetPVarInt(playerid, "LDrunkL", GetPVarInt(playerid, "DrunkL"));
if((GetPVarInt(playerid, "FPS") > 0) && (GetPVarInt(playerid, "FPS") < 256)) {
return GetPVarInt(playerid, "FPS") - 1;
}
}
}