Step 1: Install CheatEngine (.org)
Step 2: Select Foundation from the list of processes (top left search icon)


Step 3: Check off "Enable Speedhack", set the multiplier to 2x-5x and hit 'apply'
It will speed up time in-game more than the vanilla 3x and can be toggled on/off


And that's it! It doesn't feel like cheating to me, the villager's timing isn't affected and I've found that it doesnt put too much of a strain on my PC at 5x speed, any higher and the game can slip out of control or crash potato PCs- it's just moving along the inevitable so you're not idling IRL too long waiting for resources/new immigrants to appear so you can finish your buildings.

Speedhack doesn't usually work in any online/multiplayer game but it's very useful for city builders!

Now go have fun expanding at the speed of light!