Why is PE12 so much slower than PE11?

I have been using PE11 on a quick machine with 8GB of RAM without any issues.  Thought I'd 'Upgrade' to PE12 and everything is (literally) 10 times slower.  I have to render everything before I can ply it in the timeline (never had to render in 11) and the rendering can be as slow as one frame a second.  Obviously this is unworkable when I import 20mins of video and it's 40,000 frames to render.  If I import the same info into PE11 it doesn't even need rendering.  I can drag along the blue arrow and see it all move as fast as I like with the stuttered audio going along with it.  In PE12 I need to move the arrow to a given point - stop it - and wait about 5 seconds to see the frame that is there and then it might play after about 5 seconds. 
It's driving me mad and I just can't fathom it.  Same machine - same file - same request of the software, but drastically different results.
I want to get my money back on PE12 as it was a waste of time - but don't know if that is possible.
Anyone else experiencing performance issues with 12?
Looking on the Internet in general it seems many many people have this issue (one chap had 32Gb RAM and experienced the same problems).  Must be down to the software.
Cheers

Hi ATR - and thanks for the comprehensive comments.  I am also running Windows 8.1 64 bit.
Appreciate the advice on getting a refund for the software - I may well use that if I can't find out why things are so slow.
I will try to answer your questions below...
I bought this laptop new a couple of weeks ago, so not much opportunity for things to get too clogged up yet - having said that, one of the programs that always goes on any of my PC's is Ccleaner so that was installed right away (and has been regularly run).
I actually tried the Adobe support chat 3 times last night - but each time I was onward connected to tech support and after pleasantries, they dissapeared each time. So I gave up on that.
Yes - I have 11 and 12 on this same machine.  In fact I've been experimenting this afternoon with using each program in isolation and also together - loading snips of video and rendering / saving / exporting to DVD.  I am burning a DVD now with 11 which is the only one I have the patience for at the moment.  I'll try burning the same clip from 12 when this is done.
Then there are the typical questions...
a. What project preset?
b. What are the properties of what is going on that Timeline?
c. Even with your present computer environment, how much multitasking is going on?
d. Latest version of QuickTime installed?
e. Run As Admininstrator and User Account with Administrative Privileges?
f. Video card/graphics card driver version up to date according to the web site of the manufacturer of the video card/graphics card?
a. Not sure about the project preset (am new to Elements) but I guess they are default - I did notice when I went to 'adjust' and 'Smartfix' there was a green icon in it - so I clicked reset to get rid of that - thought that might have had a bearing on the slow speeds.
b. not sure of details here either - I have basically used a USB to phono convertor to transfer a load of Video8 footage off my camera with the default settting (MPEG).  I've been capturing for about 30mins at a time and then putting 2 or 3 of the 30min sections into the timeline (but have also now played with far smaller (2 to 5 minute) sections of captured video to compare and contrast on speeds for various processes with more manageable chunks of video. Thus far I am leaving the video as is - I.e.apart from introducing a transition affect between sections, I have no narration or effects or soundtrack - just the raw MPEG video (and sound) on video1 and audio1
c. Multitasking apps / programs - I do have a few things running, but nothing serious - I will get rid of all else that's running when carrying out some more tests - good point, thanks.
d. Erm - not sure about QT - will have a look and update this evening if necessary
e. Yes - running as admin - although I possibly wasn't before... Do I have to right-click the icon to invoke this every time?  I tested after running as admin and it made no difference
f. Like QT - I will check the video card software - being a new machine I did have it do quite a few updates when I got it home (including 8 to 8.1 upgrade).
I have now captured about 30 hours of Video8 from the late 80's onto the laptop and need to move on to my next video camera, the VHS-C beast which has early footage of the kids etc.  It feels good to know I'm finally getting this stuff digitised, but I won't be able to cope with editing and burning it on DVD at the speed PrE12 is going...
Thanks again for the time in coming back to me.  I shall address the QT and video card drivers issues tonight and see how I go.
Fundamentally, I just cannot see why I have such a pronounced difference in performance between the two versions - seems very odd.
Cheers,
Tom.

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    If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
    Other things you can do to gain space.
    Delete any old or no longer needed emails and/or archive older emails you want to save to disc, Flash drive/s or to ext. hard drive.
    Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
    Again, archive to disc, Flash drive or ext. hard drive and/or delete any old documents you no longer use or immediately need.
    Uninstall apps that you no longer use. If the app has a dedicated uninstaller, use it to completely uninstall the app. If the app has no uninstaller, then just drag it to the OS X Trash icon  and empty the Trash.
    Also, if you save old downloaded  .dmg application installer  files, you can either archive and delete these or just delete the ones you think you'll never install, again.
    Download an app called OnyX for your version of OS X.
    When you install and launch it, let it do its thing initially, then go to the cleaning and maintenance tabs and run all of the processes in the tabs. Let OnyX clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
    Typically, iTunes and iPhoto libraries are the biggest users of HD space.
    If you have any other large folders of personal data or projects, these should be thinned out, moved, also, to the external hard drive and then either archived to disc, Flash drive or ext. hard drive and/or deleted off your internal hard drive.
    Good Luck!

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