On 10/02/17 12:47, martin brinkmann wrote:
> On 10/02/17 11:53, Matthias Kronlachner wrote:
> 
>> Starting with an empty patch placing and dragging objects is very laggy.
> 
>> Does somebody have the same problem or a fix for this?
> 
> i had similar problems with various versions of pd on various
> linux-versions, with the free radeon driver.

meanwhile i have solved this problem by using the free radeon driver
(xubuntu 14.4, with xenial kernel), and writing a minimal xorg.conf
containing

Section "Device"
        Identifier      "radeon whatever the cards name is"
        Driver          "radeon"
        Option          "AccelMethod" "glamor"
        Option          "ShadowPrimary" "on"
        Option          "DRI"           "3"
        
EndSection

the important option was ShadowPrimary (which needs glamor though).
this option enables "fast cpu access to pixel data". maybe there is
a similar option hidden in the settings (directx?...) for other
graphicscards on other os too...

...after having added a global "gui refresh metro" to minimize updates
of moving sliders etc. to my patches, everything works now (again) fine
without that...

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