Is there a workaround to increase the number of charts to more than 15 on a page ?
This looks like an enhancement. See the following:
Need to increase max number of charts for ON-demand Charts per Item with multi-metric view types
if you are asking for more charts as report extraction perspective then in 3.6 the option is available to extract complete report.
i think in 3.6 i think you can export all the page ,but it can be scheduled as mail.
Do you mean to say that all the charts can be included in the report when sent as a email but not when viewing on dashboard or exporting as pdf manually ?
Ok, I see this in the 3.6 release notes. I think this helps me up to some extent . But still its good to have this working when exporting manually or in dashboard .
You can now generate PDF files and CSV files containing the full set of data. Previously, only the first page of a dashboard was attached and sent in an email message. If you select all pages, an email message is sent with a time-sensitive link to the report containing all pages. For more information, see Share Data with Other Users.