Creating labels is slow until exporting labels

[InsaneFirebat]

Creating new labels takes longer and longer as the project grows. It can become unusable with a big project. However, exporting the label list corrects the issue and new labels are created quickly again.

SuperMetroid.zip

1. Launch Diz and load the Super Metroid.diz project
2. Create a new label anywhere in the disassembly
3. Notice the long delay before Diz is actionable again
4. Go to Tools > Label List
5. Export the labels anywhere with any name
6. Create another new label anywhere
7. Notice the long delay is reduced dramatically

Uses the JP/US/NTSC version of Super Metroid