Using FME(R) 2021.2.5.0 (20220331 - Build 21816 - WIN64)  desktop on windows PRO build 2009.1766 65g RAM, 6 cores, experiences massive CPU drain when running a LIDAR density analysis out to raster via the custom transformer as in article - Calculating Point Cloud Density (safe.com)

The two step tiler seems to trigger a Windows security scan when using the FME_TEMP directory as FME writes the (many) temporary cache ffs files down to disk when demanding a 1m high res raster result. The security kicks in and the CPU starts skipping up to 80%+ which drags the performance way down on large LIDAR file sets. Setting the raster res lower (10m) doesn't seem to trigger the same issue

The FME_TEMP directory cannot be included in the security white list (corporate policy settings only - as each workstation /individual may have a different FME_TEMP location), and therefore although FME and the install directories are white-listed per FME Community (safe.com), the FME_TEMP directory is subject to security processes.

Has anyone else come across this? Is there a workaround? Any advice on whitelisting file type ".ffs " as an option to avoid security scans?