A console error which seems not so serious?:
Synergism.js:1373 Uncaught TypeError: Cannot read property 'greaterThanOrEqualTo' of undefined
at buyProducer (Synergism.js:1373)
at HTMLDocument.onPress (Synergism.js:374)
I think the speed should be reworked as it's far more powerful than anything else once hit the 100 limit now. For example start from 400 speed we take 2.5 second for one attack, and then with 1000 speed we attack once per second, to attack 10 times a second it will need 10000 speed.
You're possibly right on that. I'll check it and fix it in the update coming tonight! EDIT: This has since been fixed!