Wow, the difference is clear. The activation of vdpau has brought me a lot, additionally deactivating Vsync has improved my result significantly. Thanks Andrew for this great hint.

Sam


    
On 17.05.19 22:29, Phyllis Smith wrote:

    

    

      
      

        

          
On Wed, May 15, 2019 at
              4:35 PM Andrew Randrianasulu <randrianasulu@gmail.com>
              wrote:

          

          
wild guess: 

          
 

          
Not
              so "wild" after all.  This was an amazing
                discovery/knowledge that Andrew passed along that is
              much appreciated for anyone with an Nvidia card using
              Cinelerra and having low frames/sec.

            

          

            

            Try to enable/disable Vsync in ... driver's control
            application (I assume you use proprietary drivers with
            Nvidia GTX-750ti)

            

          

          
Thank
              you and I am adding this to the manual in the GPU hardware
              acceleration section for others who have not seen this
              here.  Thank you Andrew!  More wild guesses needed! 
              GoodGuy/Phyllis