Suggested fix this problem (bug)

Your carrier's speed reaching very low with the LCD enabled function.

If you enable the LCD function for 2011UIAS RM model, the overall speed of your service slumps. For example. If I have contracted with my carrier 120MB, my speed actual is 30MB with this feature enabled. If you disable the function (LCD), its speed back to normal working. I suggest that developers launch a fix for this problem.

In another topic I found the solution to my problem:

http://forum.mikrotik.com/viewtopic.php?t=93553

My topic I created earlier with the same problem is below:

http://forum.mikrotik.com/viewtopic.php?f=2&t=112828

Could at least tell us what RoS version(s) you're running and/or have tried. Number of firewall rules, any L7 filters?

I only get a small performance hit on my rb2011, but if you're already pushing it close to it's limit with other features then that might push it over the limit.

Could at least tell us what RoS version(s) you're running and/or have tried. Number of firewall rules, any L7 filters?

I only get a small performance hit on my rb2011, but if you're already pushing it close to it's limit with other features then that might push it over the limit.

I have two subnets:
1 - (Subnet 1) Static without DHCP and no bandwidth control
2- (Subnet 2) Dynamic DHCP, Nat, Hotspot, IP bandwidth control,
3- 83 Rules Firewall in total
4 - Use L2TP for external access to this network
5 - Used version - 6:37
6 - Do not use L7 or web proxy
7 - Two WANs links in failover mode
8 - Do not use fast track