Is it a myth that: the more we seed in bittorrent, the faster our bittorrent downloads?
If i stop all my seeding, will my downloads slow down?
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You'll have to distinguish between a torrent with many seeds and a bittorrent client which is seeding many torrents:
Note that the bandwidth taken by seeds are mostly upstream so it doesn't make a great difference to download speeds which mainly depends on downstream capacity.
Also note what TookTheRook mentioned about etiquette. If you look at it in terms of give and take you should at least upload enough to reach a 1:1 ratio (that is, so that you've uploaded as much as you've downloaded).
Not seeding torrents can slow down your speed depending on if the BT server or other clients perceive you as a leech - and hence give you reduced priority on their upload slots.
Seeding can also slow down your download, atleast 2 cases are:
Case (1) is more likely to happen, just cap the BT upload at say 80-90% of your upload bandwidth and it'll be fine.