I check this test, avast performance results is not good, why?
Those tests are just a small moment in time.
If they conduct it e.g. 10 minutes later there could be a different result.
And what is not good ?
Protection against 0-day malware attacks: 99%, industry average is 97%
Detection of widespread and prevalent malware discovered in the last 4 weeks: 100%, industry average 99%
etc. etc.
Looks fair to me although I never really pay any heed to these as real life is what counts
Performance is based on a single run whereas Avast gets better over time with caching