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The tweak tester can notice packet retransmissions during the test file transfer. This is not a disaster. The Internet has weather, and the weather is not always sunny. When there are storms (congestion or other problems en-route), packets can get dropped and must be sent again.
Persistent and high numbers of retransmissions may also be due to a high RWIN (receive window) on your end, which is why they are reported.
Retransmissions of data reduce throughput, reducing the speed at which you receive data. Particularly lossy links (perhaps representing ISP congestion, or even problems on your own line), wreak havoc on download speeds, even reducing them to a crawl.
A Line Quality Test may reveal more about the source of your packet loss problems.
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