Does seeding slow down other stuff?

If i just let qbit do its thing as a window in the background, does it slow other things down?

For example: If i try to play an online game will the ping get higher?

Another example: If i play any game will my fps get lower?

I'm sorry if this is a stupid question, I'm just new to seeding, back when my father taught me torrents he never cared to teach me about seeding so it's foggy to me.