Server-Side Patch 5.1.148 – Chinese
"To help keep the meta fresh, we're making tweaks to some of the top-performing civilizations. In this patch, you’ll find that it will take more time to build walls and defensive structures, you'll see a few adjustments to the Chinese civilization, and other balance changes to the Malians and Mongol civilizations. Read on to learn more!"
General
Cost increased from 15 stone to 20 stone.
Developer note
"Stone walls are a very powerful option for shutting down raids. We wanted their cost to more closely match their effect in game."
Chinese
Fixed an issue where fortifications were not properly built 50% faster.
Build time increased from 8 seconds to 10.5.
Build time increased from 2 seconds to 2.5.
Build time increased from 1 minute 45 seconds to 2 minutes.
Build time decreased from 45 seconds to 40.
Song Dynasty Villager production speed changed from 13 seconds to 15 seconds (33% reduction bonus instead of 35%).
Developer note
"As we made Town Centers more difficult to build, this had the unintended effect of making Song Dynasty a relatively stronger economic option with less resource investment."
Garrison slots reduced from 10 to 8.
Developer note
"We wanted to allow more counterplay options when attacking a booming or teching China player."
Showing notes for the 
Chinese. Other patch notes are hidden.