The Faster Research Perk is unlocked upon reaching level 33 and increases the research speed and decreases the research cost of blacksmiths and royal forges.
All of your research start with 1 day of progress already complete, so all upgrades finish much faster. All upgrades cost -1 gold.
Blacksmiths need 1 night less to finish an upgrade and cost 1 gold less. Resulting in offensive upgrades needing 2 nights to finish and defensive upgrades just 1.
