Net speed becomes too slow when another device connected?

-i'm aware that it's natural for your net speed to become slower when other devices connected, the problem is it becomes too slow. when playing online games my normal ping is like 60-100ms, even if i opened many browsers, its barely recognizable. but when the laptop is used and someone opened even a single browser, my ping skyrockets to 600-1k+. help pleaseidk, live with it or upgrade ur internet.