You seem to have multiple different questions.

To answer the one in your title, traffic shaping basically kills the benefit of squid caching, as it likes to shape the cache hits, which is exactly NOT the desired behavior (at my site, anyway) for items in cache. I've tried shaping and had that happen, so I turned it back off.  :-
I've tried a byzantine and poorly documented procedure to try and make cache hits appear to be ACK packets and then give the incoming ACK queue loads of bandwidth (on the assumption that most actual ACK packets are going the other way, so you can get away with that) which sounds nice in theory, but in practice either from being byzantine, or poorly documented, or "darned if I know" it simply blew up and killed all traffic until I rolled the configuration back to a previous save point (be sure to make one before messing with the shaper - you may need it.)
It seems like a common enough combination (we cache to improve performance, we also want to Shape/QoS to improve performance) that there ought to be a more functional way to get there - but I haven't found it yet.

is it possible to shape traffic of different mac adresses in the lan? i find it quite disturbing using IPs as i like to keep dhcp working

Sorry for the error.  Glad it's working.

The rule that assigns the queue needs to be placed somewhere where it catches state generation.

To shape connections started by LAN clients out to WAN, the best place is probably a floating match rule on WAN out.

To shape connections inbound to servers, the best place is usually in the pass rule on WAN that allows the traffic in the first place.

Yes  - manually.
Im just need limit all trafic on WAN to speed <20 mbps (but really speed 77mbps)
how made it?

ps. wizard dont help too..

Ok, i ran your script for 3 different nameservers. I'm addind the results as an attachement

Why not add all names one by one like a001,a002 to the aliases. It takes time but it should work if they are all of them

cs.steampowered.com.txt
hsar.steampowered.com.edgesuite.net.txt
steampowered.com.txt

I think that is what I am going to do.  I read this post and learned quite a bit more.  The rest of that thread is good too.

@fsSnowboard:

Here is the google help page on how to find the current Google IPs.  Shaping this way though, as mentioned above, will probably cause issues, because these IPs also are for google.com, gmail.com, etc.

Like i said,I suspect there is no absolute ip cidr for a specific service but you can furher distinguish a service (like mail.google.com) by defining an alias for it too and creating a new rule before the "google" rule.

As for today gmail uses 173.194.0.0/16 if anyone interested in checking that in following weeks or months.

AS KOM said PRIQ is pretty easy to setup and understand.  Seems like a good fit for what you want to do.  The wizard is 1 size fits some, so be aware of that.  It will get you a basic setup from which to start however.
My advice is to make aliases for the different server/service/ip's.  That way if anything changes you don't have to muck with the fw rules, you only need to change the alias entries.

@lordkitsuna:

@Derelict:

Set bandwidth and link share (m2) to the same value.

Thanks so much i now have it working and everything behaves as expected. My torrents can take up the speed when nothing is going on but as soon as i start playing games they get dialed back enough that my games ping remains unaffected.

Awesome.

Unless I have something configured somewhere that I'm not seeing that is causing this, it would seem to be bug.

Yep…sounds like a plan!  8)

+karma for a fast and thorough response - thanks!

I want to limit the combined download to 20 mbps and upload to 5 mbps. I'm not sure what or how many devices will be active, so I currently have an alias set for all my devices called "famUp." With your guide, I think I've got what I need. I'll know for sure when they move in tomorrow! Thanks again.

@KOM:

pfSense has supported that NIC since last year, so you should be fine I would think.

Everything appears to be working correctly.  Had to up the mbuf settings but that seems to be the only issue so far.