cl_interp_all
cl_interp_all is a console variable available in all 
Source games.
…
This ConVar controls some code optimizations for running client-side prediction. When set to 0, the optimization is run; only the set of entities that need interpolation are considered. When set to a nonzero value, the old behavior is run, where every networked entity is considered for interpolation.
See also
For other useful information on console variables, please head back to the Console Commands Listing
