This practice reduces the number of round-trip times.
You can see the filter in action at
www.modpagespeed.com on this
Parameters that affect JS combining
pagespeed MaxCombinedJsBytes MaxBytes;
MaxBytes is the maximum uncompressed size in bytes of the combined
MaxBytes will be
each being no more than
MaxBytes in size. The current default value
MaxBytes is 92160 (90K).
This filter currently cannot combine across inline scripts, and IE conditional comments.
pagespeed MaxSegmentLength 250;
By default, the filter will combine together script files from different paths, placing the combined element at the lowest level common to both origins. In some cases, this may be undesirable. You can turn off the behavior with:
pagespeed CombineAcrossPaths off;
walks the DOM looking for
<script> entries with certain
script locations and structure.
This filter is sensitive to
document.getElementsByTagName('script') will not be