Hello!
CLI version:
[boris@MikroTik] /routing filter> /ip route print where dst-address=89.223.20.65/32 Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit
DST-ADDRESS PREF-SRC GATEWAY DISTANCE
0 A S 89.223.20.65/32 VL1.350 1
Runs about 1-2 secs
API:
<<< /ip/route/print
<<< ?dst-address=89.223.20.65/32
<<<
Runs more then 2 minutes!!! Yes, I have 3 bgp full view on router 
But why CLI is quick and API is terrible slow?
P.S. CCR1036, 6.36 ROS
Regards,
Boris