Ok here is the configuration:

Point 1 :
-RB411R
-ROS 5.2
-Bridge (Station Bridge for Wifi and Ethernet)

Point 2 :
-RB411R
-ROS 5.2
-Bridge (Station Bridge for Wifi and Ethernet)

Point 3 :
-RB433
-ROS 5.2
-Bridge (2 x AP Bridge for Wifi and Ethernet)

When you take bw test it shows around 134 bytes / second, ping is around 4-5ms, distance of antennas is ~300 meters.
If i transfer files, watch video surveillance or do anything else, it's around 22 Mbit/sec.
RSTP is ON for all three bridges?