Very bad performance when transporting multiple notes

[GeorgeTsakiridis]

Problem
When I try to transpose a lot of notes (e.g. transpose a whole song - 1500 notes in my example) the program takes a long time to complete the action.

To Reproduce
Steps to reproduce the behavior:

1. Open a .mid file, consisting of a lot of notes (about 1500 in my case)
2. Select a note
3. Press ctrl+A to select all notes
4. Drag them upwards or downwards

Desktop

• OS: Windows 11
• Browser: Chrome
• Version: 130.0.6723.117 (Official Build) (64-bit)

Additional context
My PC has good specs, so the performace of my computer is out of question.