How do I make my Black MIDI songs not lag?

[DVDPlayerLol]

Hello. I am a guy who makes Black MIDI songs. Most of my melodies sound start glitching because of the number of notes even though most of them are all muted. How do I prevent this?
EXAMPLE:


I saw many Black MIDI sequences where the sound was perfectly fine despite having a ton of notes. Is there a possible way I can achieve this?

[TheUpperDiamond]

Fast graphics mode.

Go to more tools > Fast Graphics.

[DVDPlayerLol]

I meant like the sound not start glitching despite most of the notes being muted.
I have multiple instruments of different colors so that I can make the MIDI art more appealing.

Fast graphics mode.

Go to more tools > Fast Graphics.