Change Details

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-04-24 15:23, hash: `rBa8441fc90086` Worked: Same happens in 2.82 / previous versions. **Short description of error** Adding a Mirror Modifier and using an empty or another object to mirror across, causes slow viewport performance, if SubSuf Modifier is also in the stack and enabled. **Exact steps for others to reproduce the error** 1. Add a Mirror Modifier, and choose another object / empty as a mirror position/target to use. 2. Add a subSurf Modifier before or after the Mirror modifier, and turn up the viewport subD Levels so is more dense. 3. Tried to move/rotate that object and notice very sluggish performance. 4. Disable subSurf Display in viewport, and notice much higher performance/updates. 5. Enable subSurf Display , but then Clear mirror modifier object / use object itself as a mirror (no mirror target) and notice much better viewport performance. A workaround, is to always disable subSurf display in viewport when transforming objects with this setup, I suppose. But I still wonder if there's some optimizations/things to do, to fix this/improve for future? Maybe this will be part of highpoly mesh viewport perf for 2.9? {F8494647}

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-04-24 15:23, hash: `rBa8441fc90086` Worked: Same happens in 2.82 / previous versions. **Short description of error** Adding a Mirror Modifier and using an empty or another object to mirror across, causes slow viewport performance. **Exact steps for others to reproduce the error** {F8497811} # Open file # Move Suzanne - Notice performance # Remove Mirror Object from mirror modifier # Move Suzanne - Performance much better You can apply subdiv modifier, it shouldn't have an effect.

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 980 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.75 **Blender Version** Broken: version: 2.83 (sub 15), branch: master, commit date: 2020-04-24 15:23, hash: `rBa8441fc90086` Worked: Same happens in 2.82 / previous versions. **Short description of error** Adding a Mirror Modifier and using an empty or another object to mirror across, causes slow viewport performance, if SubSuf Modifier is also in the stack and enabled. . **Exact steps for others to reproduce the error** 1. Add a Mirror Modifier, and choose another object / empty as a mirror position/target to use. 2. Add a subSurf Modifier before or after the Mirror modifier, and turn up the viewport subD Levels so is more dense.{F8497811} # Open file 3. Tried to move/rotate that object and notice very sluggish performance. 4. Disable subSurf Display in viewport, and notice much higher performance/updates. 5. Enable subSurf Display , but then Clear mirror modifier object / use object itself as a mirror (no mirror target) and notice much better viewport performance. A workaround, is to always disable subSurf display in viewport when transforming objects with this setup, I suppose. But I still wonder if there's some optimizations/things to do, to fix this/improve for future? Maybe this will be part of highpoly mesh viewport perf for 2.9? {F8494647}# Move Suzanne - Notice performance # Remove Mirror Object from mirror modifier # Move Suzanne - Performance much better You can apply subdiv modifier, it shouldn't have an effect.