timal for streaming: piece 0 may be
requested from a slow peer, and fast peers will get requests for later-index
pieces instead of retrying more-critical ones.</p>
<p>The time-critical logic does more <em>active management</em> of peer request queues,
such that the most time-critical pieces occupy the &quot;best&quot; queue slots, across
all peers. It can be considered an advanced version of <tt class="docutils literal">sequential_download</tt>.
The main trade-off is that it is more complex to implement and