Hello Unreal Community,
We have been working with the Replay System Unreal provides for a while now in both 4.21 and then in 4.22 after upgrading (the Replay System we use: Using the Replay System in Unreal Engine | Unreal Engine 5.1 Documentation).
After the upgrade last week, many issues with the Replay System were fixed and game play was smoothest as ever. We were very pleased with the upgrade at first.
But suddenly, after working with 4.22 for a while, in-game FPS suddenly dropped to less than 60 FPS (before it was around 100~120). The FPS drop happens immediately after starting to record using the Replay System. The 40~50 FPS drop is critical to the overall performance of our game.
We tried the following:
- Restart the Computer.
- Rollback to a last version of our game using 4.21
- Rollback to the first version of our game using 4.22 were game play was smoothest as ever
- Update drivers (GPU, etc)
- Update Windows
- Verify Engine 4.22
Nothing seemed to solve the problem for 4.22. We realized the following after a few more tests:
- This big drop does not happen in 4.21 (FPS drops by 3~5 FPS only)
- This big drop does occur in the first version of our game using 4.22 (when originally it was the smoothest and highest FPS game play we ever had).
- We usually use Unreal in EPIC quality. But even after lowering the quality to LOW, this same 40~50 FPS drop still occurs in 4.22.
- Everybody’s computer started having this issue when we all came in on Monday this week (15th of July)
Without the Replay System in 4.22, the FPS is back up to the usual rate. But the Replay System is core to our game and to this point, we have no idea why this has happened. This issue started to appear at the same time to everybody when we came in for work on Monday this week (15th of July).
Any ideas will be greatly appreciated!