KiCad 9.0 Lag When Editing Legacy Schematics

When opening an older version schematic with KiCad 9.0 for editing, there is noticeable lagging or stuttering during schematic editing operations . What could be the reason for this?
schematic editing operations as shown in the video
录制_2025_03_05_23_27_47_174.zip (2.9 MB)