[Bug]: performance issue on large single page

[Luciogi]

What happened?

A bug happened!
when moving around on canvas

Platform Tested:
WPA(firefox)
Android

File: https://github.com/LinwoodDev/Butterfly/files/15015668/butterfly.bfly.zip

Version

2.1.0-rc.0

Platform

Android

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[CodeDoctorDE]

thanks for reporting, i tested it myself and on firefox it is very buggy, on windows it seems to handle it (maybe because the pc is better than a phone)

[Luciogi]

Umm After comparing Chromium and firefox (on Laptop with power mode on performance) both give nearly same performance when moving around on canvas. From my previous observations I think so my laptop was running on power saving mode

I think that, tools like path eraser and eraser are causing performance issue

[CodeDoctorDE]

Okay thanks. I just wanted to be sure I could reproduce this behavior.
I will look at it and try to fix it

[Luciogi]

path eraser tool when delete an element whole visible area is canvas is rerendered.
I am also not sure if it refresh objects what are not visible on screen

bdf04323-5fac-49fe-aa2b-3007df3760ed.mp4

[CodeDoctorDE]

Which version do you use currently?

[Luciogi]

2.1.0-rc.3
just installed latest apk from gitbub actions

[CodeDoctorDE]

Okay thanks, i will check it

[CodeDoctorDE]

fixed in 2.1.1-rc.1

[Luciogi]

32e6522d-66d6-4d44-8b4a-aa428eccbfa1.mp4

• the easer path pointer is also too slow
• Erasing path, misses paths , it could be due to slowness of pointer

[CodeDoctorDE]

thanks for testing, I will try to improve this a bit

[coordinatio]

I have also started hitting this issue.
It seems that after some time, initiation of a new line starts taking time. In the same time, the drawing process itself seems snappy.
Here is the screen recording illustrating what I face: https://youtube.com/shorts/7eW-GMl0ZOI?feature=share
Here is the note file from the video: output.bfly.zip

Seems like there is some logic going when a line being initiated, and that logic is somehow badly dependent on the number of lines present on the page.

My device is Samsung Galaxy Z Fold 5, must be quite performant for the time, so hardware is not the case.
Butterfly's version: 2.2.1

[CodeDoctorDE]

Okay, thanks for reporting and an example file.
I have some ideas where these long delays are coming from. I will test them and come back to you

[CodeDoctorDE]

i added some performance improvements but if this doesn't help, you could disable autosaving in the settings

[pisceswb]

i added some performance improvements but if this doesn't help, you could disable autosaving in the settings

Disabling auto-save can effectively prevent the lagging phenomenon of handwritten pen strokes, especially on pages with a lot of handwritten content. However, it would be helpful to add a feature that automatically saves the content upon exiting the page to avoid losing notes. Thank you.
@CodeDoctorDE