AVCHD files in PrPro 5 (playback- & editingproblems)

Question

Hi
I have to edit a project in PrPro CS 5 with AVCHD files:
(MediaInfo:)
General
Complete name               D:\(...)\STREAM\00002.MTS
Format                            BDAV
Format/Info                     Blu-ray Video
Overall bit rate mode      Variable
Overall bit rate               16.2 Mbps
Max. Overall bit rate      18.0 Mbps
Video
Format                                    AVC
Format/Info                             Advanced Video Codec
Format profile                         [email protected]
Format settings, CABAC        Yes
Format settings, ReFrames    2 frames
Format settings, GOP             M=2, N=13
Codec ID                                 27
Bit rate mode                         Variable
Bit rate                                   15.1 Mbps
Maximum bit rate                    16.0 Mbps
Width                                     1 440 pixels
Height                                    1 080 pixels
Display aspect ratio              16:9
Frame rate                            25.000 fps
Color space                          YUV
Chroma subsampling            4:2:0
Bit depth                               8 bits
Scan type                             Interlaced
Scan order                           Top Field First
Bits/(Pixel*Frame)                 0.389
Stream size                          23.3 MiB (93%)
My problem:
The playback of the files is very very bad - even in low resolution.
Reverse playback starts after a delay of maybe 3 sec.
There are about 300+ clips in this project.
Everytime I open the project PrPro links (loads) all these files AGAIN - which takes apout 1 or 2 minutes.
Computer
Win7 64bit / PrPro CS 5 / nVidia Quadro 4000 / 24gb RAM / 2xQuadCore
Optimized for best performance etc.
Solution?
AVCHAD is Interfame - I think this causes the problems.
I tried to encode to DNxHD 120 but this is slow, too.
So, what should I do?
Best regards
jo

Answer 1

Thanks for your quick reply!
This is not my computer here (and it is not in my company).
This computer is connected to an intranet and to the internet.
So AntiVirus, Firewall etc. is activ...
Premiere Pro Version:
Version 5.0.3 (005(MC: 218798))
        ("Adobe Premiere Pro v5.0, Scully")
nVidia driver:
261.30
Discs:
System C: SSD 250 gb
Data D: 2 tb (one disc, internal, no raid)
CPU:
2 Intel Xeon Quadcore @2.40GHz
Performance settings:
YES: Indexing and compression turned off (both discs)
YES: Aero turned off (win classic, no sounds)
YES: MSN and Sidebar removed
NO: anti-whatever turned off
NO: iTunes (they say they need it...)
MOSTLY: similar crap removed
SOME: unneeded processes turned to manual (like mDNSResponder, jusched, etc.)