Emulator - switching between chat tabs is really slow

[mewa1024]

Github issues should be used for bugs and feature requests. Use Stack Overflow for general "how-to" questions.

Version

nightly 4.1.45039 (but was also slow in previous versions)

Describe the bug

Give a clear and concise description of what the bug is.

To Reproduce

Steps to reproduce the behavior:

1. Open a bot.
2. Open a chat with an endpoint.
3. Open another chat with endpoint.
4. Click on the Welcome tab.
5. Click back on the endpoint tab.
6. It can take more than 1 second for Emulator to react.

Expected behavior

The tab should load more quickly. If it is a loading problem, there should be some feedback to the user that tab is refreshing so they don't keep clicking on the tab.

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

I was using the Basic bot template which starts with an adaptive card.

[bug]

[tonyanziano]

We know that this is related to the number of Webchat (livechat / transcript) tabs open. We have a hunch that it is due to excessive re-rendering of the Webchat component.

[justinwilaby]

Another note, this seems to be exacerbated when Adaptive Cards are being rendered in WebChat.

[tonyanziano]

@justinwilaby and I have confirmed that this is due to the performance of the UpdateConversationMenu command on the main side.

I will look into how to optimize the re-drawing of the app menu.

[tonyanziano]

Addressed in #1180