Summary
Windows clipboard history may cause Illustrator to slow down or freeze when copying complex artwork.
Update to the latest Illustrator version to resolve this issue. After updating Illustrator, the clipboard no longer includes SVG code by default when you copy artwork. This improves speed and reduces lag with complex selections. If you often copy artwork between Illustrator and other apps that rely on SVG formats (like browser-based editors or other vector tools), you can toggle the setting back on anytime.