What is the meaning of [More haste, less speed]

Something, even if it isn’t what you ideally would prefer, is better than nothing.

This proverbial saying is found in John Heywood’s 1546 glossary A dialogue conteinyng the nomber in effect of all the prouerbes in the englishe tongue:

Moste tymes he seeth, the more haste the lesse spede.

There is a citation which appears to be earlier, in the Scottish Troy Book, which was published at some time in the first half of the 16th century. That includes:

Of fule haist cummis no speid.