@DG7YEO: one last tip: try to reduce your samplerate from 8MHz to 5MHz, that should reduce CPU load a bit. But LDPC decoding is clearly the bottleneck here. That only gets better with strong signals, because LDPC decoders need a few attemps (iterations) until the signal is free of errors. So more computing power is needed for weak signals.
You may have problems with the beacon, but the other Signals should be fine.