Yesterday I updated my Vegas 21 365 installation from v208 to v300. v300 worked well while I was editing my current project. However, when I tried to render the video, I found that the render was about 1/3 of the speed on the previous version (v208).
My project is UHD shot on a Panasonic GH5 in HLG. My Vegas project is set to render in UHD HDR10 using Aces..I am using the Mainconcept HEVC encoder.
I measured the difference between the two versions: I took a single event and rendered it using v300.
- With the Intel ARC A730M GPU selected, the render took 7:18 to complete at an average frame rate of 1.41fps.
- With the Intel Iris Xe GPU selected, the render took 7:38 to complete at an average frame rate of 1.34fps.
After restoring from an Acronis backup of my computer that was taken shortly before I installed v300, i rendered the same event again in v208.
- With the Intel ARC A730M GPU selected, the render took 2:21 to complete at an average frame rate of 4.42fps.
- With the Intel Iris Xe GPU selected, the render took 8:51 to complete at an average frame rate of 1.17fps.
Note that v208 is around 3 times faster than v300 using the ARC A730M.
When I render using v208 and earlier, my CPU runs hot at around 93 degrees but the CPU usage only averages 86%. The clock rate remains high for this computer at around 3.9ghz. The A730M GPU is around 38% utilised.
When I render using v300, my CPU runs at around 80 degrees but the CPU usage is 100% (all cores fully utilised). The clock rate is lower at around 2.9ghz. The A730M GPU is around 6% utilised.
I now cannot open my current project in v208 as the project file was significantly updated yesterday using v300.
I am happy to act on any suggestions. I hope that the Vegas team can resolve this problem. It is possible this issue only affects Intel ARC GPUs.
My computer is an Intel NUC X15 i7 notebook with 64GB of ram and a 12th gen CPU. It is running Windows 11 with the latest Microsoft and Intel updates.
Thanks and Regards
Dennis MF