I've just launched the new update for Pyramida, mainly addressing game-breaking slowdown issues involving roads. To make sure you have the new version, uninstall and re-install the game. There should be a new setting in the option-menu, that's how you can tell.

Changelog:

Optimizations

• Fixed a freeze involving pathfinding on a savefile with a lot of roads. Most people who built a lot of roads would experience the game slowing down to a crawl or even freezing - this should be fixed now!
  
• Fixed a bug where skeletons would do pathfinding too often, which slowed down the game.
  
• Added an option to set the pathfinding's roads preference (from realistic to fast) so roads are still useable on lower-end computers.
  
• Fixed a bug on OSX preventing it from doing a certain optimization: Mac users should now have a much smoother running game overall.
  
• Farms are now culled when outside of the screen.
  

Other Changes

• Added Steam Screenshot integration - press F12 to take a screenshot!
  
• Fixed a bug where skeletons would become invincible after completing the game.
  
• Fixed a bug where demolishing a gate would make it appear to be floating.
  

Thanks for your patience - hope this fixes the slowdown issues!

- rub