For scraping proxies or VPN required or not

I want to scrap sites with GSA website contact please guide me for this I need proxies or not 

Also GSA website contact scraping is very slow how can I scrap fast websites 

Also GSA proxy scraper is good tool for buy?
Because I see free proxies or not reliable then why we get GSA proxy scraper 

Do you want to scrape search engines for targets or check the actual sites?

For search engine scraping you will need good proxies.

For site checking no proxies are needed.

If I use GSA website contact for scraping without proxy any issue 

And why it scrap few thousands sites in whole day for sending we can a lot of messages but for scraping it's very slow 

I set scraping/search 2000

I have very heavy machine and very fast internet 

But very slow scraping 

Check your logfiles. I bet the search engines ban you from scraping if you are not using any proxies.

2000 threads is too much. It runs stable with 100-200 threads, given you have sufficient and good proxies.