is there any algorithm that can reduce remove salt and pepper or noise without damaging the text segmentation on this case like using Morphological , blur method or fastNlMeansDenoising?

for example the Morphological opening use kernel 3×3 or 5×5 still got bad result because the size of noise is various, i can’t filter the image with a lot of filter layers that can cause problem for performance and time consuming program also it need lot of resource

i have been use lot of algorithm that can remove salt and pepper or noise but still got bad result because the text segmentation also being reduce

i expect that some algorithm can reduce this salt and pepper or noise from this image without much of filter layers