I have the same issue (slowness).
In addition, the "new link" function is now not working.
I sent an email to support and received a reply that user who have alot of annotations (as I do) are experiencing performance issues since the last major release.
They said they are working the issue and understand the importance of getting this fixed.
I'm just standing, not adding much because it's so slow.
If I use the app on my phone it works fine so I can use it as is, but won't be adding much until they get this sorted.