Help! upgraded but game still lags

I have a HP dx 2200 desktop and put in a few parts to upgrade it to what I thought should suffice for playing Diablo 3. new power supply, graphics card and more RAM. Just because, the operating system was just reinstalled and updated to sp3. So the computer is clean of bog. The system now is as follows:

3.3 ghz Pentium 4
2 gb RAM
AMD Raedon R6670 2gb PCIe 2.3 HDMI output
450W PSU
80gb Hard drive
Windows XP sp3 directx 9.0; fresh install

when playing diablo 3 (i.e. not heavy graphics) I experience terrible fps drop when the scenes get busy and especially when loading a new level or area. The graphics seems to be fine, sharp, fully loaded etc. but the game play itself lags and hesitates. I have tried increasing the virtual memory to no avail. and likewise in-game graphic adjustments don't seem to remedy the load times and lags...Please Help!!! I've been racking my head around this! Thanks!
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More about help upgraded game lags
  1. - Diablo 3 is graphically intensive despite it's appearance.
    - Try setting your pagefile to 256MB (min/max) and see if Windows complains about virtual memory while playing. (You may have made it too large).
    - Try installing GameBooster to disable the 'extra' services that HP install, as that will free 1GB of physical memory for the game.


    Windows® XP/Vista/7/8 (latest service packs) with DX 9.0c
    Mac® OS X 10.6.8, 10.7.x or newer*

    Intel Pentium® D 2.8 GHz or AMD Athlon™ 64 X2 4400+
    Intel® Core 2 Duo

    NVIDIA® GeForce® 7800 GT or ATI Radeon™ X1950 Pro or better
    NVIDIA® GeForce® 8600M GT or ATI Radeon™ HD 2600 or better

    1 GB RAM (XP), 1.5 GB (Vista/7/8)
    2 GB RAM

    12 GB available HD space
    12 GB available HD space

    DVD-ROM (required for retail disc versions only)
    DVD-ROM (required for retail disc versions only)

    Broadband** Internet connection

    1024x768 minimum resolution


    Windows® 7/8 (latest service packs)
    Mac® OS X 10.7.x or newer

    Intel® Core 2 Duo 2.4 GHz or AMD Athlon™ 64 X2 5600+ 2.8 GHz

    2 GB RAM

    NVIDIA® GeForce® 260 or ATI Radeon™ HD 4870 or better
    NVIDIA® GeForce® GT 330M or ATI Radeon™ HD 4670 or better
  2. Your CPU is holding it back.

    A 3.3 ghz Pentium 4 (not sure which model the 3.3GHz one is) should have HyperThreading but does not have two physical cores like the Intel Pentium® D 2.8 GHz or AMD Athlon™ 64 X2 4400+ mentioned in the minimum requirements.

    They recommend Intel® Core 2 Duo's and Athlon™ 64 X2 5600+ (2.8 GHz) which are significantly more powerful than a 3.3GHz Pentium 4 (despite having lower clock speeds, they perform somewhere between 2 and 6 times the work per clock cycle).

    If you're based in Australia I can help you find cheap parts.
  3. Going to go with old/slow P4. As above if they say a P4D is needed and you have only a p4, it won't work well. Time for a new machine.
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