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It is ALL i , timeline around 33:15 can be seen clearly.
However, you've enlighten me to do another test.
https://youtu.be/nlfWYtQV3fc
(BTW, the video was originally filmed for the seller to explain something wrong with his product, so I didn't use English😂)

Do you think it can improve that it is the card's problem?

https://youtu.be/bbLmnnokBCg

Thank you for your test advice, Walter! I  sincerely follow your instruction to do the test and make it into a video.

However, the result is quite...as you said, it dosen't make any sense!

Merry Christmas!

So sorry that I've make a mistake!  I think the 'successful data' is from my old 64GB card .After formatting my 256GB card in the camera, the problem is still here.

Dear friend,
I would guess, CF cards over 64GB are in a different data format. This should be formatted in ExFat. Are you sure you formatted the card in the camera before you recorded?

Your Bruno  x

God!!! Thanks Bruno  ! Got the point!
This is the result after formatted in the camera! And all is well again!!
Benchmark complete.
ets) tiply. 2022Dec02.5D3113, 6c65806f1ee2+ (crop_rec_4k_mIv_
Mode: PLAY-UNK LCD. Global Draw: OFF CF LEXAR ATA FLASH CARD LEXAR ATA FLASH CARD
Write speed (buffer =16384k):
118.8 MB/s
Read speed (buffer =16384k):
Write speed (buffer =16384k):
151.1 MB/s
117.5 MB/s
Read speed (buffer =16384k):
151.2 MB/s

Modules tab -> activate bench.mo
Restart cam in photo mode
Access Debug tab ->  Benchmarks -> Card benchmarks -> Quick R/W benchmark (1 min)

Cam will write results as BENCHx.PPM to card.
Proceed benchmark for both cards and post results.

Thanks and here's the result
https://drive.google.com/file/d/1m3yqIAMkQ5Zpd3x_IoimYUiG6exhimeh/view?usp=share_link

64GB:
Benchmark complete.
ets) tiply. 2022Dec02.5D3113. 6c65806f1ee2+ (crop_rec_4k_mIv_
Mode:
PLAY-PH LCD, Global Draw: OFF
Write speed (buffer =16384k):
Read speed
(buffer=16384k）：
Write speed (buffer =16384k):
Read speed (buffer =16384k):
66.4 MB/s
72.1 MB/S
64.0 MB/S
72.0 MB/s

256GB:
Benchmark complete.
ets) tiply. 2022Dec02.5D3113. 6c65806f1ee2+ (crop_rec_4k_mIv_
Mode: PH-LV LCD, Global Draw: OFF
FF IFXAR ATA FIASHCARD
Write speed (buffer =16384k):
Read speed (buffer=16384k):
Write speed (buffer =16384k):
Read speed (buffer =16384k)
6.6 MB/s
6.4 MB/s
6.6 MB/S
6.4 MB/S

Camera:5D Mark iii
Firmware:1.1.3
Danne's Build:https://www.magiclantern.fm/forum/index.php?topic=23041.0
CF Card:Lexar 256GB 1066x
Problem: 256GB Card has extremely low write speed around 6.5mb/s while 64GB CF card work well
(PS:the 256GB card has been formatted by mac disk utility and tested by Blackmagic Disk speed test app)

Blackmagic Disk speed test snapshot
https://drive.google.com/file/d/1qgNRt0cND3HMBIZ4_3wvQwWnoi6nYSlO/view?usp=sharing

The problem is described in detail in the video below
https://youtu.be/smvPj0lBt58

Can anyone help me ?