To fix lagging in Cycles renders, address model complexity, render settings, or hardware issues—common causes of slowdowns. - Simplify meshes: Use decimate or lower subdivision levels to reduce high-poly counts. - Adjust Cycles settings: Lower sample counts (try 64–128 for previews), enable denoising, and turn off unneeded features like motion blur. - Optimize textures: Compress files or reduce resolution for texture-heavy scenes. - Upgrade hardware: If GPU/CPU is limiting, invest in a better graphics card or processor.
This keeps previews fast while maintaining usable quality, helping you iterate quicker without lag.