Briefly, what is the routing performance capability of RB2011UiAS (with external switch) VS a CRS125-24G-1S-IN , both with a pair of ports connected to dsl router (10Mb/s dwn - 1Mb/sup dsl bandwidth) ??

Thank you

Compare the performance tables on product pages.

These speeds are routable with whatever mikrotik device even 10 years old like nothing.

what is the routing performance capability of . . .

Compare the performance tables on product pages.

Adding to Jarda's advice, I'd recommend that you compare the routing-with-firewall-rules values for each platform - in particular, I'd say the middle-sized packet column is the most realistic for considering "real world" traffic, which is almost never all 1500-byte packets or tiny packets.

CRS is primarily intended to be a switch - so don't grab one thinking that you've got a beast of a router with a bazillion ports all over it - it's primary intent is to be used as a hardware-forwarded switch. When using the routing features, the CPU can take a big hit - notice the rapid drop off in performance on some CRS's performance tables.

However, as Jarda says, 10M is easily achievable with nearly any Mikrotik product.

i think you are on the right point of a frequently asked question at the forum and their respective consequences of someone buying a device which in the field do not meet their expectations

i think mikrotik has to document and establish device performance beyond the actually published performance:

Bridging (fast path)
Bridging 25 bridge filter rules
Routing (fast path)
Routing 25 simple queues
Routing 25 ip filter rules

For example CISCO for ISR routers (direct competitor of some mikrotik products) has published documents about

iPsec Maximum performance per platform
Firewall performance throughput and concurrent sessions
QoS performance test using mixed size packets at 75% CPU usage
Nat performance test using mixed size packets at 75% CPU usage

Beyond That CISCO establish recommendations to position the device by:

IPSEC performance
Nat + QoS +ACL performance at 75% CPU usage with mixed size packets

All this information are consolidated in a more simple and GLobal Performance positioning:
WAN Circuit Speed with services enabled recommended for the device

Thank you for answers

I've compared side by side those machines on routerboard.com

Cpu, cpu speed, ram size, storage size are the same

I have a little experience with 2011 and three to five dsl lines pcc/routing mark managed and a little firewall config
They all work flawlessly

So I suppose CRS machine would do the same
I've read about CRS problem in managing hi.speed dsl routers, but someway solved working around ethernet queues....
Any thougth ?

Thank you for answers

I've compared side by side those machines on routerboard.com

Cpu, cpu speed, ram size, storage size are the same

I have a little experience with 2011 and three to five dsl lines pcc/routing mark managed and a little firewall config
They all work flawlessly

So I suppose CRS machine would do the same
I've read about CRS problem in managing hi.speed dsl routers, but someway solved working around ethernet queues....
Any thougth ?

keep in mind some cpu resources go to managing the switch chip

But anyway crs125 will manage these speeds easily.

Nice to hear it from you...

Thank you