Are you comfortable using Rclone at the command line? We can also try sending you a beta version of BlompGo that may address your issue.
I'm not sure what Rclone is, but I work in I.T. so I shouldn't have much trouble. Let's give that a try. I'm just heading home for the day so won't get a chance to try it out until tomorrow afternoon but I'll give it a try then and let you know how it goes.
We've made the updated BlompGo available in the dashboard... so if you wouldn't mind, please download the new version and let us know!
Ok, well, that's something.
We'll keep an eye on the performance question for you.