Sorry about that I am not computer savy
the laptop is a HP with quad core A4 5000 accelerated processor with radeon HD graphics
500GB hard drive
4096 MB ddr3 SDRAM w/ windows 8.1
internet download speed 16.25 download
I don't know what a seeder is
I also run Netflix on this laptop without any problems
Doesn't matter what the seeders have, although if there is only 1 seeder that is likely your issue. What are the specs on your desktop?
I don't know a whole lot about the A4 5000 (or any of the APUs for that matter), but in a brief quick search, it should be handling 720p mkvs just fine, and I would guess most 1080p but again I don't know much on those. If your desktop specs are significantly higher that may tell us something.
Suppose on the laptop when things aren't playing well you can take a look at the task manager and see what your CPU usage looks like.