>>532551048
Everything I do before construction bots is in service of unlocking and automating construction bots and roboports. I can't overstate how much robots help.
Yellow and purple science are very expensive compared to the other sciences, I would go to space and get space science (which is basically free in space age, which I assume you're playing) going before yellow or purple. Here's a comparison of the science costs of the first three combined, compared to both yellow and purple.