Blender startup time and shader compilation is a big factor when running hundreds of tests, so now all renders in the same ctest run in the same process. If a test crashes, the remaining tests in the same category will be marked as skipped. Benchmarked on a quad core with ctest -j8. cycles: 118.1s -> 94.3s eevee: 66.2s -> 29.2s workbench: 31.7s -> 8.6s