$animblocksize
$animblocksize is a QC command available in all 
Source games.
…
If this is specified, all the animation data will be written to a .ani file, and when sequences are needed, the data will be loaded on demand. This is helpful for streaming animation data of Cinematic Physics. The "size in K" is the block size the animations will be grouped into. Sizes between 4K and 64K are fine, though 16K or 32K has better memory fragmentation characteristics.
The nostall option will make the first section not demand load but by included in the .mdl file.
Bug:In games with support for compressed (repacked) maps, the client will crash when attempting to load on-demand animation data if the content is packed into the BSP.Syntax
$animblocksize (size in K) ["nostall"]
Example
For example in 
modelsrc qc, "general_dest_plaster_set.mdl"
$animblocksize 32 nostall highres
