This method is on how to speed cracking with tools such as Sentry MBA and Multiforce.
Method:
First Method:
1. Right Click on "My Computer" and navigate to "Properties" and then click on the tab "Hardware" and then to "Device Manager".
2. In Device Manager select "Ports" and expand the "Ports" tab
3. Right click on the "Communication Port" and click on "Properties" then to "Tab to Port Settings" and change the Bits per a second to "128000"
1. Right Click on "My Computer" and navigate to "Properties" and then click on the tab "Hardware" and then to "Device Manager".
2. In Device Manager select "Ports" and expand the "Ports" tab
3. Right click on the "Communication Port" and click on "Properties" then to "Tab to Port Settings" and change the Bits per a second to "128000"
Second Method:
1. Click Start-->Run-->type "gpedit.msc" without the "
2. This opens the group policy editor. Then go to:
3. Local Computer Policy-->Computer Configuration-->Administrative Templates-->Network-->QOS Packet Scheduler-->Limit Reservable Bandwidth
Hope I helped! :P I have terrible internet so it really helps me to crack!