Does it work any better if you resample to 44.1kHz in DSP Studio > Output Format?
Unfortunately not, it seems even worse.
Also, could you post your JRMark score from Help > Benchmark?
Here it is ! Can you tell me what does this benchmark mean ?
=== Running Benchmarks (please do not interrupt) ===
Running 'Math' benchmark...
Single-threaded integer math... 4.675 seconds
Single-threaded floating point math... 3.112 seconds
Multi-threaded integer math... 2.438 seconds
Multi-threaded mixed math... 1.692 seconds
Score: 1594
Running 'Image' benchmark...
Image creation / destruction... 1.415 seconds
Flood filling... 0.758 seconds
Direct copying... 1.336 seconds
Small renders... 1.638 seconds
Bilinear rendering... 1.887 seconds
Bicubic rendering... 1.012 seconds
Score: 2734
Running 'Database' benchmark...
Create database... 1.664 seconds
Populate database... 2.035 seconds
Save database... 0.201 seconds
Reload database... 0.079 seconds
Search database... 1.358 seconds
Sort database... 1.146 seconds
Group database... 0.943 seconds
Score: 2895
JRMark (version 18.0.156): 2408