If you are using a Windows OS

If you are still experiencing problems after changing the settings you might want to try this windows patch

EviD Patch

It will increase the limit of half-open connections, window will allow at the same time. default is 10. experiment with different limits and see what works best for you. If it doens't help, then use 10 again, as you are will spread malware faster to other computers if you are infected with anything

Warning: read carefully what it says on the webpage before using it. Your virusprogram will probably delete it when you try to open it, as it will recognize it as a hacking tool.

Disconnect your internet and disable antivirus while patching, and then reenable it after youre done.

Also you will need to reapply the patch everytime you update windows, because windows update will reset it

use at own risk. I do