I started using program recently, and I really like it.
The UI is lagging too much, when browsing my torrents, or even changing my settings!
I'm using windows 10, CPU: Core i3,
Any help would be appreciated. Thanks.

These are commonly reported symptoms. As yet a solution remains a mystery.

How may torrents are you seeding?
How many are you attempting to download?
What is your In and Out BW levels from ISP?

How may torrents are you seeding?
10 torrents
How many are you attempting to download?
1 torrent
What is your In and Out BW levels from ISP?
ummm my full download speed is about ~400kb
and the upload speed is ~70kb