Havent seen an micro sd benchmark with random read 4k for n900,
might be fun and interesting considering the constant swapping of the device.

Are we approaching the bus limits with a 20 bucks card?
Samsung evo 32GB
vs second n900 in bootmenu usb storage ramdisk mode.

(i tried to include stats here, but formating makes the tables unreadable )
remarkable:
4k random read 6mb vs 5mb,
is 17 MB the sd card bus limit? (4 * 48Mhz(maybe more?) / 8 should be about 24MB/s)