FCPX10.1.1 does not solve the problem with long-time clip editing!

Question

OS: clean installed mac os10.9.1
FCPX: FCPX10.1.1
Project: 4clips, all of the clips is about 1 hour long (dvcprohd)
Disk: 900MB/S++
machine specs:
2*3.06Ghz 6-core
24GB DDR3
and I've tried these graphic cards:
K5000
and
2 5770
all get the same results:
If I double press the "L" key, the response of FCPX is too slow
If I do other operation like browse the clip, or import long time clip,
the FCPX will become too slow to browse the timeline.
I've found the FCPX like to generate audio waves of the clip and
there's no option to shutdown this! I've tried all the options in FCPX like
do not show the waveform of audio in preference and close the audio waveform in timeline
I don't think I can work the project with 10.1.x.
the 10.0.9 also has the 1st problem, but don't have the 2nd problem.
Another project: 2000++ 4K 50P clips(XAVC), but on FCPX 10.0.9, all of the clips is less than 40mins, always 20seconds.
though it will get slower when we import clips day after day,
it's much more smoother than 10.1.1!!!!!!
so,
I don't think we should update to 10.1.x for the little promotion of performance.
and 10.1.x also do not support nvidia K5000 card.
the render is slower than ait5700.....
I hope apple can solve the problem,
all of the above is just basic editing needs!
if the fcpx can not do even a long-time clip editing
why should I use it?

Answer 1

2 project:
1. 4*1 hour clips dvcprohd
that's the problem! I can not bear it.
2. 2000++clips 4K XAVC 50P project which I don't run on FCPX 10.1.1
I run it in fcpx10.0.9, it's fine, but slower when I imported more and more clips.
until now I can bear it.
the fcpx10.1.1 editing long-time clip has problem:
1.
it use 150MB/s harddisk speed to generate the waveform.
I have 900MB/s disk speed, so that's not the problem,
but it generate all the time!
1 hour clip's wavefrom generates for 1 hour without stopping, if I stop it , the fcpx crashed!
2.
when I skimming the clip for editing, the fcpx gets slower, always 2mins to response my operation.
3.
when I double press J or L key, the fcpx will need about 1 min to response.
the FCPX10.0.9 editing long-time clip problem:
the fcpx10.0.9 can handle the long-time clips, but also has very slow response when I doulbe press J or L key.