Just found a workaround: If I copy and paste the entire schematic into a new file, the problem goes away. The marker list goes back to the default set without duplicates. Copy-pasting is smooth again. Interestingly, the file size drops from 3 MB to ~250 KB, indicating that some sort of memory build up is an issue (or can become one).
Just found a workaround: If I copy and paste the entire schematic into a new file, the problem goes away. The marker list goes back to the default set without duplicates. Copy-pasting is smooth again. Interestingly, the file size drops from 3 MB to ~250 KB, indicating that some sort of memory build up is an issue (or can become one).