The speedguide is great for setting up a variety of variables but it does fall short if your test speed falls half way between two of the possible speeds listed.
1. Take your download speed result in kbits and divide it by 8 (you now have your result in kBytes.)
2. Take your speed in kBytes and multiply it by 0.8 (this now gives you a proper download speed of 80% of you tested max)
3. Go to Options > Preferences > Bandwidth and put your result in the "Maximum download rate" box.
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