Entity Limit
For reasons of memory allocation, there is a limit to the number of entities 
GoldSrc/
Source/
Source 2 can manage at once.
The combined size (in bytes) of a map's entity data should also be considered, even if the number of entities is within safe limits. Large amounts of entdata can take a noticeably long time to transmit from server to client, and may lead to crashes.
Tip:When creating very large or detailed maps, remember that more entities will exist at runtime than were compiled in. Things like weapons held by characters, projectiles and death ragdolls are all entities too. If you see "no free edicts" errors then you need to start cutting! GoldSrc limits
The default edict limit is 1200, but this can be raised to 2048 by editing the mod's liblist.gam to include edicts "2048".
This can safely be done for singleplayer mods, but should not be relied upon for multiplayer maps for existing games, as the server and all clients must agree upon the edict limit.
In 
Sven Co-op, the limit has been raised to 8192.
Prior to 
Half-Life's 25th-anniversary update, aswell as some standalone GoldSrc games, the default edict limit was 900.
All entities on the server are edicts, and are networked to clients. Intangible entities can be made clientside-only using MAKE_STATIC, but they will be removed upon loading a saved game.
Source limits
There is 2 groups of entities:
- Non-networked entities are entities which exist only on the client or server (e.g. death ragdolls on client, logicals on server). There can be 2048 of these in pre-VScript branches, 6144 otherwise (
, 
, 
, 
) - Networked entities are associated edicts, which can cross the client/server divide. There can be 2048 of these.
- In
Garry's Mod, there can be up 8192 networked entities, and 8192 non-networked entities. - In
Mapbase, there can be up to 16384 "clientside renderable" entities. (Internal point entities, like prop_static's) [1]
If the game tries to assign an edict past the limit it will exit with an error message, but if it tries to create a non-networked entity past the limit it will merely refuse and print a warning to the console. The logic behind this may be that an entity spawned dynamically (i.e. not present in the map) but not assigned an edict probably isn't too important.
The two entity lists are created by CBaseEntityList::CBaseEntityList() using NUM_ENT_ENTRIES and MAX_EDICTS. Neither of those values can be changed without breaking compatibility with the engine.
In VScript games, non-networked entities have 2 extra bits reserved compared to edicts. Since the pool of entities is shared between entities and non-entities, this is why non-networked entities have a higher limit.
Tip:
- Temporary entities and prop_static's, env_sprite_clientside, or prop_detail props do not count toward either limit. VBSP enforces limits for these, but these can be raised with a modified VBSP.
- If you're creating lots of individual objects all the time, consider rolling them all into a single manager entity.
- In-game, use console commands like
report_entitiesandcl_showentsto get an idea of how many entities are present at that current state. - Prop entities that use a model with $collisionjoints will generate one phys_bone_follower for every convex piece of their collision model. These can quickly eat up the edict count! Enabling the "Disable Bone Followers" keyvalue on the prop will disable bone followers, although the prop will no longer have a functioning collision model, and the model will not be able to ragdoll.
VMF Limits
Hammer itself has no entity limit, but 
VBSP's is dependent on the game:
- 8192 in
Source 2007/
Source 2013 - 16384 in
Alien Swarm/ Portal 2 - 20480 in Counter-Strike: Global Offensive
- 65536 in Mapbase/ Garry's Mod, since March 2024.
Note:This is a soft limit; a modded VBSP is capable of compiling as many entities as memory allows.Note:The limit is set by MAX_MAP_ENTITIES variable in 
public/bspfile.hThis is double the combined total accepted by the engine, which may be because it at first treats internal entities (such as prop_static and env_cubemap) like normal entities, or perhaps because it generates a lot of detail props.
VBSP also recommends an entdata size limit of 384KB, but this is in no way enforced.
Source 2 limits
In Source 2, specifically 
S&box, the networked entity limit is 16384 edicts.
There appears to be no limit for map compiles, or it is tied to the networked entity limit.
See also
External links
References
- Mapbase 3.1 Release Notes https://www.moddb.com/mods/mapbase/news/mapbase-v3-1-released ModDB Retrieved Wednesday, March 6, 2024