Hi guys! Thanks for submitting this. I totally hear you and have experienced this as well.
The good news is, we’re actively working on this. We recently pushed an update that improved performance when channel switching and scrolling. So this should be considerably better for you.
We’ll continue to make improvements on performance, so stay tuned for updates.
Keep the suggestions coming and thank you for helping us make Teams awesome!
Great performance and user experience remain a topmost priority for us. Application launch time has seen improvements in the recent build. We will continue making improvements across the product including channel to chat switching and overall resource consumption.