I'm glad to hear, that it's working now for you.
The performance of HLSL (and the quality of some effects) depends on the used prescale. There are two prescale setting in MAME, prescale and hlsl_prescale_x/y. Never use both with HLSL. For your graphics card set prescale to 1 and hlsl_prescale_x/y to 0 (automatic) or between 3 and 5.
I hope to resolve these performance/quality issues with the next version of MAME.
You could also improve the performance by disabling effects you don't need. You can disable defocus, phosphor, bloom, color offset/convergence separately by setting all depending parameters to 0. Bloom and defocus have the most impact.
If you still have performance problems, let me see your configuration.
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