Frame skipping Error

[Silverhood]

Hi I am new to Magic Lantern. I have Canon 5D M3 (Frimware 123) and Installed Magiclantern-Nightly, Installed Card is Lexar SDHX 1000x 150MB/s 32GB. As i try to shoot ML Raw video, it starts skipping frame right after 4 sec in 1920x1080 and 14 sec in 1280x720 resolutions. Is there some setting in ML menu that has to be optimized or the SD card that m using is not capable???

[mothaibaphoto]

Current raw video capabilities

[Walter Schulz]

5D3's SD-card interface (UHS-I, btw) is limited to about 21 MByte/s in write mode.
Get a decent CF-card.