If you inspect the HTTP headers of a page generated by Tiki, it has an Expires header in the past:
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Beside that, I also suggest to enable caching, at least in the Raw page display (tiki-index_raw.php?page=), it enables the browser to cache frequently used information by something like the AJAXLoad plugin and improves performance.
Now the Pragma header has:
And the cache-control header:
Cache-Control: no-store, no-cache, must-revalidate
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