@MrPrinceApe Don't do it in the first place?
Opera has to wait for the network when you open multiple tabs at once. Depending on how many different files a given site uses, opening 10 tabs at once might mean accessing 100 or more files spread across the internet, and your network can only access so many different files and so much bandwidth at one time. And then the browser has to render that data into a web page.
If Opera freezes when you open too many tabs at once, the obvious answer is to spread them out by only opening a few at one time, then once a couple of those are done open a few more.
