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When you say the LAN is more efficient than a WAN, why do you think that? LANs often have more bandwidth and usually much, much less latency than WANs, but what context are you thinking of efficiency?
If you're wondering what to do about upgrading your VXR, if you were thinking a newer IOS would make the router run faster or more efficiently, that's generally not the case.
In your other posting, if lcd_shouldit's post is correct (and it may very well be, I never validated whether your IOS version was available or whether your system met its system resource requirements), you may be unable to upgrade your VXR. I believe the whole VXR and supporting "engines" are all end-of-life . Depending on your processing performance needs, a 3900 series might be a suitable replacement or the faster ASR 1000 series.
