I am working on a application which uses Ext.net 2.0. On every page post back more then 7 MB of data is returned most of which seems to be related to Ext.net. I am attaching a screen shot in which you can see there are multiple Ext.axd files are returned and their combined size is close to 7 MB.

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Name:	ext.axd.png 
Views:	95 
Size:	29.6 KB 
ID:	25170
Can you please help me what are these Ext.axd files and how can i either cache these files or avoid them all together as this seems to be causing impact on the application performance.