Make indexing in web version less taxing

Every time i open my To Do account on a new machine or new browser i have to deal with enormous lagginess and can't use To Do for 15+ minutes. I have thousands of completed tasks. I am guessing it tries to cache/sync them. But why it locks its web UI in the process? The other day it happened on all my machines where i use it every day. Just started lagging horribly with CPU being pegged to 100% by Edge and Windows Indexing service. I guess, you changed something and had to resync all the tasks. And i had to deal with it every morning while switching to a new machine. While mobile and desktop app were working fine. Only web version is this sub optimal. And i prefer web version over desktop, because it is plain and simple and it allows to resize steps panel more than desktop version.