Why USBHost_Mass_Storage is so slow on LPC1788,LPC1850

[lpcware]

Content originally posted in LPCWare by whoms on Sat Apr 28 17:51:31 MST 2012
I've tested nxpUSBLib 0.94 on LPC1788,LPC1850. USB flash disk is directly sector wrote using USBHost_Mass_Storage .
The speed is only 150KB/s. And I've verified the LPC1850's USB0 host is set at High Speed mode.
LPC1788 is running at 108MHz,USB CLK=48MHz
LPC1850 is running at 167MHz,USB CLK=480MHz

Can anybody give an explanation ? How to improve the USB flash disk writing speed to about 1MB/s on LPC185x or LPC435x ?

[lpcware]

Content originally posted in LPCWare by tuong on Wed Jul 04 18:15:36 MST 2012
Dear Whoms,

Your topic is interested! Can you share to me how can you test the speed of this library? I see there is v0.95 release, is this issue still exist on this new version?

Thanks & regards,