Slammin' hammer: https://tf2maps.net/downloads/slammin-source-tools-v2-hammer.9286/
Slammin' compilers: https://tf2maps.net/downloads/slammin-source-tools-v2-compilers.9287/

**THIS EXE IS NO LONGER RECOMMENDED AS OF 1/12/22**
Stock TF2 vrad has had vrad patch's changes implemented, as well as further performance improvements. This should be used instead of vrad patch from this point onwards.


Improvements to stock vrad:
*A simple edit of the stock vrad.exe, the only change being multithreading. This means compiles are far faster than normal vrad's for both HDR and LDR, without any disadvantages

Install instructions:
-----Hammer-----
*Move the contents of the /bin/ folder to /Team Fortress 2/bin/
**Your path should be /Team Fortress 2/bin/<.exe and .dll files> after this
*In hammer, go to Tools -> Options -> Build Configurations, and set up vrad_patch under VRAD
*Compile your map
-----CompilePal-----
*Move the contents of the /bin/ folder to /Team Fortress 2/bin/
**Your path should be /Team Fortress 2/bin/<.exe and .dll files> after this
*In your compilepal folder, go to /GameConfiguration/GameConfigs.json and edit it to point to vrad_patch.exe instead of the stock tf2 vrad.exe
*Compile your map


NOTE: be wary when using a mix-and-match of slammin' compilers with other compile tools (like stock vrad with slammin' vbsp and vvis) - it may cause issues with the compile despite no clear errors

Full credits to Ficool2 for this patch

Simple speed comparison, note this is not representive of the benefits on all maps and CPUs: