I have contracted 600 Mb symmetrical internet and running the Movistar fiber test only gives me about 350 Mb download and 570 Mb upload.
If I disable the Avast antivirus and do the test again, the result is 594 Mb download and 594 Mb upload. That is, without AVAST, my download speed doubles.
I have the default values applied in Avast. Is there any parameter that can be updated or modified to mitigate this important loss?