DLink routers don't have any way of limiting band width, more over they just ensure everyone gets good Quality connections and services through the router.
The lag your seeing comes from other users, there networks, there ISPs and there router set ups. Not everyone had good quality routers and most users are not using the advanced features on the routers to help there network and others to gain better connections. Other users are trying to game over wireless and if thats not set up right and along with other devices using that same wireless connection, you can only imaging what the router and wifi is trying to do an maintain connections.
I can understand to a point that what your trying to do is to compensate for some of the lag. I don't think it's possible here. We've tried to maintain that setting up these routers, ISP modems and networking to gain the best possible connections between user devices and the ISP. That basically all we can do here.
By trying to compensate for your experiences in gaming by trying to compensate fro the lag, could have other ramifications and work against you and others playing. I do also see many issues with BO2 and other games as well as others on this forum using other model routers. We've gone thru all the settings and made sure everyone is running well between the devices and the ISP modems. Yes we still see junk while playing.
It's not something that we can easily fix by changing MTU or QoS values. DLink routers don't have any such band width limiting features as I think DLink believes more in QoS features in there engines and they do work well when set up well.
You could try setting the priority of GameFuel to a low setting maybe however I don't think this would result in anything since it depends on other devices being online and running Gamefule rule. If your the only one onlne gaming then the router gives you all it can anyways. Having 2 or more boxes online at the same time, now thats different.
Try setting the MTU value differently however again, this could effect how the router communicates with ISP modem down the road. Most cable systems use a default value of 1500, while DSL uses anything from 1492-1472 down to 1300 sometimes.
More Info here for lag compensation:
CoD - This is Lag Compensation ExplainedI think you need to make sure that your ISP services, ISP signal lines, ISP modem and your DGL-4500 are set up well for the best connection you can get. Ensure T.V. line splitters are removed from cable systems if possible, if one is needed, use a GOOD Quality splitter. Dedicated cable internet line is preferred though. For DSL, ensure phone lines are in good working condition and filtered correctly. Seen a few users with ISP not connecting the lines correctly or marketing giving users DSL services well beyond line distance limits that should not be exceeded. Run all new wires if need be for Cable or Phone. Use CAT 6 LAN cabling on all of your wired devices. Use of newer model ISP modems and stand alone modems, ones with out built in routers is highly preferred. If this can be achieved then you'll know that your system is running right and should be able to handle anything. Just be aware that all of the other junk you see while gaming, probably coming from other users and there systems that are not set up well and realistically can't be fixed.
Maybe someone can review your router settings with you using Link>
teamviewer if your interested. Its safe and secure.
Good Luck.