Drawing the "Currant Errand" list seems to significantly hinder FPS. But it might be something else also.
FPS according to Steam, without a status window open: around 22fps. Click on a mealwood plant to open the status window: around 20fps. Click on a duplicant: around 12fps.
Steps to Reproduce
Linux, Haswell integrated video (i3-4330), 16GB RAM. Compare FPS with no status window open vs various other things.
This issue has been fixed in either a future version or updated in a previous version.