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Considering current single-core 1Ghz WP7 devices run circles around dual/quad-core iOS and Android devices when it comes to performance and responsiveness, I highly doubt this will be the case.

That's like the N9, which is single core, 1ghz, and it runs far smoother with many applications running than most higher end Android devices.

Plain and simple explanation, Dalvik is too top heavy.

It is not just processor speed. Some apps wont run because of the reduced amount of memory.

Thom, the truth is they dont run rings around dual core ios and Android devices. Honestly i wish you would bring some objectivity to your arguments.

You forget some very important facts :

* windows phone only supports 480x800 resolution the galaxy nexus runs at 1280 x720 thats like 4 times the resolution, the iphone 4/4s is 960 x 640.

Thats a major limitation of the platform currently, and its part of their spec, just face it wp7 doesn't support resolutions above this and its a clear limitation of their software stack.

* wp does not support nfc

* wp does not support proper multitasking.

* wp does not have a single phone that is dual core, this points to a genuine limitation on the kernel. Regardless of current comments coming from qualcomm, its pretty obvious that up until now it has not been able to support dual core processors, otherwise why wouldn't the Nokia phones ship with dual core processors ?

* wp does not have a single phone that supports 1080p video recording.

Does any one else have anything else to add that windows phone doesn't support ?

Seriously was this paragraph even necessary ? Your comparing a phone to a tablet, why dont you compare the phone to an iphone 4 ?

IOS is smooth, I have not heard a single complaint about IOS performance on the iphone 4 or 4s, dont you think your comment is an exaggeration here ?

Windows phone 6.5 performed like ass and that was available only a few years ago, comparing these current phones to 10 yr old tech that didn't even have support for multi touch capacitive displays is a bit off, did it support graphics acceleration ? did it do any sort of 3d / graphics effects ?. Your dealing with completely different tech, seriously, its a really bad point to make and proves absolutely nothing.

I am not bringing up android, even though its my platform of choice as perception is at play you "feel" performance is smoother, so therefore assume performance is smoother even though android is doing and balancing a lot more at once than all other current platforms on the market, in fact I Love my Galaxy Nexus, its a thing of beauty.

The real competition is with the High end devices, the big money is in the high end smart phones. Aren't alarm bells ringing in your head right now ? Instead of announcing phones with 720p displays and dual core processors, they are announcing support for lower end phones ? Doesn't this show clear limitations in their software stack ?

The latest and greatest windows phone 7.5:

http://www.theverge.com/products/lumia-900-lte/4624 still 800x480, still only single core, whats the point of such a massive phone if the resolution is that low ?

Maybe it will, but if what the blog says is true, MS is handling this "opening for variability" way better than Google.
Still, the hw part of WP7 ecosystem is still incomparably poor compared to even Symbian. They will not gain friends in Samsung or HTC of Huawei (who has just debuted their own SOC) before they fix that.

As a side note, WP7 phones may bring the smoother experience, but with apps that actually need some number crunching (like processing digital content on device in semi real time) Android shows its nails.