There is an effcient way to slow down units by burrowed units.
This mainy resorts in the amount of waits occuring, not the amount of units burrowed.
Using units burrowed results in high game lag.
By decreasing the wait time, it slows the unit to a crawl.
Approximately 4/7 the regular speed when used at 0ms.
If you increased the wait, it slows the unit much less.
Ill experiment more on this, and get back to you on the statistics.
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Uhh to elaborate on that (and because i think it can be interpreted wrong i'll put in my 2 cents.
Whenever you move a borrowed unit below another (or a air unit) then that unit will skip one frame of its animation resulting ina breif pause.
You can create multiple variations of slowing a unit down by adjusting how often you move the burrowed unit below it. Normaly people slow it down to the max possable because it is moved at the same rate of the hyper trigger (the smallest wait possable).
I doubt multiple burrowed units will make a differance. If you want to test this set up two of the same units next to eachother one with one unit being moved under it and one with 10. With triggers order them both to move at the same time and see if one of them walks faster.
ohh its not that it can be interpreted wrong really its just that you could take
to mean two compleat opposet things.