Your mesh 3D model lags in ZBrush mainly due to a high polygon count (polycount), which strains your computer’s CPU, GPU, or RAM.
High polycounts often come from: - Frequent subdivision (adding detail layers) that builds up excess geometry. - Unoptimized mesh issues like duplicate vertices or unnecessary edges.
These force ZBrush to process more data in real time, slowing performance—especially with detailed sculpts or heavy brushes.
To ease lag quickly: - Reduce subdivision levels temporarily (press Shift+D). - Merge duplicate vertices (go to Tool > Geometry > Merge). - Close unused tools or tabs to free up resources.