IO Operation (read/write files) in IPAD AIR downgrade ~50% than the one in IPAD4

Summary:
UnZip the same file with the same native unzip method (native zlib) in IOS7, ipad air take +50% more time consumption than the one in iPAD4.
for unZip, it main perform the IO read/write files in ipad, does apple air already changes the file system ?
Steps to Reproduce:
UnZIP a file with native zlip on both ipad AIR and IPAD 4 :
IPAD AIR: 16GB
IPAD 4: 16GB
ZIP file size: 700KB
Files in zip file: 225 files (120 files are images)
after remove the images, the time on IPAD AIR will save 50% time consumption
unZip method: the native zlib
unzip time on IPAD AIR+ IOS7: ~1200ms
unzip time on IPAD 4+ IOS7: ~800ms
Expected Results:
The unzip time should be almost the same on IPAD AIR and IPAD4.
Actual Results:
For same IO operation read/write file, IPAD AIR gets the 50% downgrade performance than the one in IPAD4
Version:
IPAD4: 16GB WIFI + IOS7
IPAD AIR: 16GB WIFI + IOS7
does anyone else encounter the same problem ?
A bug already submitted for apple: https://devforums.apple.com/message/993060

I even tried porting the code to Gumbo and running it there - still, no fonts are being enumerated.
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