Laggy input

[ovalseven8]

Expected Behavior

No input latency.

Current Behavior

Laggy input.

Steps to Reproduce (for bugs)

1. Go to https://pixabay.com/de/s%C3%A4ugetiere-wildlife-teuer-fox-3218028/
2. Right click -> Copy image
3. Go to a Threema Web conversation (e.g. ECHOECHO)
4. Paste image using Ctrl+V
5. Write something in the image description (type fast, so the problem is more visible)
6. Extremely laggy input

Now try the following:

1. Go to https://de.wikipedia.org/wiki/Threema#/media/File:Threema.png
2. Right click -> Copy image
3. Go to a Threema Web conversation (e.g. ECHOECHO)
4. Paste image using Ctrl+V
5. Write something and you should notice that the input is faster now. So it seems like it has something to do with the media (perhaps media size?).

Your Environment

• Threema Web version: 1.8.2
• Threema for Android version: 3.41
• Browser name and version: Firefox 59.0.2

[dbrgn]

Thanks for the detailed description, I can confirm the problem.

[LtPatterson]

Also able to duplicate in Chrome 65

[dbrgn]

Very slow key and input event handling, time increasing with media size:

The key event takes 124ms to process. After some debugging, it turns out that the bufferToUrl filter is called dozens or even hundreds of times when typing.

Pre-converting the buffer to an URI reduced key event handling times down to 14ms.

Further optimizations in the codebase are possible and planned.

Main issue fixed in the ios branch as of commit ca93785.

[dbrgn]

Released in 2.0.0-beta.7.