Firework spamming causes lag and does this ( screenshot provided below)

Not just spaming. It also happens when you launch a firework with a creeper face

I can confirm that certain firework particles can cause severe lag, even on Win10 PC.

Attached test world:

I can confirm that certain firework particles can cause severe lag, even on Win10 PC.

Attached test world:

I can confirm that certain firework particles can cause severe lag, even on Win10 PC.

Attached test world:

I can confirm that certain firework particles can cause severe lag, even on Win10 PC.

Attached test world:

Yes, rendring is a very heavy process for most devices. I'll confirm this issue, however please check if all of your device is up-to-date to the newest version.

Yes, rendring is a very heavy process for most devices. I'll confirm this issue, however please check if all of your device is up-to-date to the newest version.

Yes, rendring is a very heavy process for most devices. I'll confirm this issue, however please check if all of your device is up-to-date to the newest version.

Yes, rendring is a very heavy process for most devices. I'll confirm this issue, however please check if all of your device is up-to-date to the newest version.

This issue with fireworks can also trigger the issue with the GUI disappearing (MCPE-14737)

This issue with fireworks can also trigger the issue with the GUI disappearing (MCPE-14737)

This issue with fireworks can also trigger the issue with the GUI disappearing (MCPE-14737)

This issue with fireworks can also trigger the issue with the GUI disappearing (MCPE-14737)