I use scrapebox too .. faster then that without inserting captcha and I don't think it's possible. Use more connections.

What is the best method to check bulk url PR? I'm using scrapebox but very slow.

Yeah scrapebox can be annoying to check big lists. Mainly because of the need for LOTS of private proxies. I can check 100,000's in a few hours for small fee..

I use a custom script i bult to get everything from semrush to ip to alexa to everything you can imagine, i might do lists for peeps on here!

I use Scrapebox + shared proxies to get it done for cheap. But I guess it depends if we are talking 10,000 vs 1,000,000.