I agree that Adobe Reader defines what it means to be "compatible".  However, for those of us running Linux Adobe Reader is not a viable option.  I used to have an rpm file for a 32-bit Adobe Reader from about 2008 or 2010.  Some library changes made it stop working.

Okular and poppler are part of the KDE project.  I found another application called Master PDF Editor which also renders Therion maps with reasonable speed.  There is a free version and it is available for all of Windows, Linux and MacOS.  https://code-industry.net/masterpdfeditor/    It is not as fast as Adobe Reader, but much faster than Okular.

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Bill Gee

On Wednesday, February 23, 2022 5:42:45 AM CST Martin Sluka via Therion wrote:

> Take care which library use each viewer. PDF generated from Therion use group transparency knockout. Check wiki: https://therion.speleo.sk/wiki/contrib:externalviewers <https://therion.speleo.sk/wiki/contrib:externalviewers>

>

> I don’t know Okular, but only correct viewer is Acrobat.

>

> Martin S.

>

> > 22. 2. 2022 v 19:29, Rodrigo Severo via Therion <therion@speleo.sk>:

> >

> > Yes, I am using Okular. Tried Firefox and FoxIt and they were instantanious.

> >

> > Thanks for the tip Bill.

> >

> >

> > Rodrigo

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>

>