TO DO LIST - on PC

I love this tool, it's easy to use you can add attachments reminders etc ..... but It's extremely slow. It's easy to accidentally tick something when you didn't mean to due to delay response. When you start typing the text is not showing up until 30 seconds later? Is there a way to fix it? TO DO LIST on iPhone/iPad works great but on PC for some reason doesn't? Any tips on how to fix it? It's just a little bit frustrating

Thanks