How big is the file that you are reading? Doing many http range requests will be much slower than doing one http request and buffering locally so that you can seek. One thing that's worked for me is to kick off downloading to disk in one goroutine and just using the underlying *os.File for seeking and reading. The tricky part is when reading the file goes faster than the download, but it wasn't too hard to write a busy loop that retried the read after sleeping for a second.
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