Mkv merge very low speed

[ben45]

Hello
I'm using this script to mux videos

@echo off
cls
set rootfolder=C:\1\
echo Enumerating all MKVs under %rootfolder%
echo.
for /r %rootfolder% %%a in (*.mkv) do (
    for /f %%b in ('mkvmerge -i "%%a" ^| find /c /i "subtitles"') do (
        if [%%b]==[0] (
            echo "%%a" has no subtitles
        ) else (
            echo.
            echo "%%a" has subtitles
            mkvmerge -q -o "%%~dpna (No Subs)%%~xa" -S "%%a" "%%~dpna.srt"
            if errorlevel 1 (
                echo Warnings/errors generated during remuxing, original file not deleted
            ) else (
                del /f "%%a"
                echo Successfully remuxed to "%%~dpna (No Subs)%%~xa", original file deleted
            )
            echo.
        )
    )
)

Muxing speed is very low. It takes over 6 min to mux a 2GB mkv file ( it only uses %30 of ram and %5 of cpu )
Is there any way to speedup?

system info : 3GB Ram
cpu : 2.70 Ghz ( 2 core )
os : windows 2008 r2 64bit

[sneaker]

Muxing speed is essentially only limited by HDD I/O. If you have 2 HDDs you can speed it up by reading the source mkv from HDD A and writing to HDD B.

[ben45]

Muxing speed is essentially only limited by HDD I/O. If you have 2 HDDs you can speed it up by reading the source mkv from HDD A and writing to HDD B.

I use VPS server with one hard drive. Do you think if i split the hard speed will increase?

[sneaker]

Two partitions will still be slow as long as they are still on the same physical HDD.

[hello_hello]

I put some raw AVC video and an AC3 stream on a single 2TB drive and muxed them into a 4.2GB MKV, and writing the output to the same drive took 2 minutes 17 seconds. The same two streams muxed from the single 2TB drive to a RAID-0 volume took 1 minute 50 seconds. Hmmmmm.... I'd hoped it'd be twice as fast......

The single drive's on a different SATA controller that's not running in RAID mode, and I think it's a bit snappier.
Anyway..... that was timed using an old quad core running XP and MKVMergeGUI 7.8.0.

Over 6 minutes to mux a 2GB file does sound kind of sluggish. Unless the drive's especially fragmented, or busy doing other stuff at the same time, or it's a slow RPM laptop drive, or it's connected via USB2.

[sneaker]

busy doing other stuff at the same time

He's using a VPS so a number of other people might be accessing the very same HDD simultaneously.