Hi, i would like to know if my mac has a virus

hi, i would like to know if my mac has a virus, ´cause in sometimes it works weird

Ralph is right (of course) about no virus.
What you are describing seems to be what might happen if all of the system's resources* are gobbled up.
*When I say "resources" - I mean memory (real and virtual), caching needs, CPU usage etc.
The web pages you describe have nothing to do with your Mac having been "infected", per se, but that kind of "Pop Over" "Pop Under" malicious JavaScript can certainly gpbble up resources. When you get the Web being mean to you, and have a lot of other APPs open too, you could max out your machine, especially if it is older like mine.
To help other members answer your question, give as many details as you can.
Include your Mac Model name and specs such as processor speed, memory, and storage capacity. Please do not include your Serial Number, IMEI, MEID, or other personal information.
Provide the version numbers of your operating system and relevant applications, for example "OS 10.4.11" , "Quicktime Player 7.6.4", "Safari 4.1.3"and any other apps you might have open when the misbehavior occurs.
Describe the problem in detail, and include step-by-step your actions that lead up to °each misbehavior.You seem to be describing at least TWO different bad behaviors
List any troubleshooting steps you've already tried, or temporary fixes you've discovered.
CCC
EDIT(added) Si quieres ser la publicación más cómodo en español, podemos usar Google Translate para entender mejor su respuesta,

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