Here's an old post on search engine roundtable that claims google's policy is to discount previous backlink juice when a domain changes ownership.  I'm not convinced whether this is actually true or something Google says to discourage excessive domain buying / 301 redirecting for SEO benefit.  The comments above seem to give varying opinions on this matter. Would be great to get to the bottom of that one!
So, let's start off with the simple website list crawl. So settings for this is covered by the general crawl settings and these apply to all the other types of crawl as well, such as the Search crawl and the Endless cruel, so pretty simple really. Delay between each request to a website. One second, this is in seconds. Secondly, concurrent websites crawl how many websites you want to crawl at any one point in time and then how many threads will concurrently crawl per website. So that's ten, a crawl of ten websites at once, and each of those websites there's three different threads crawling. That's 30 concurrent connections you've got going.

Searching for a suitable domain name for your website can be quite trying. The reason for this is that the names that you want to get have already been assigned and are not available. As an SEO you know the importance of getting a domain name that describes your business as closely as possible. For example, if you are running a car rental service, you will look for a domain name that has the words ‘car’ and ‘rental’ in it. So if you can’t find a suitable name, you could use the expired domains tool which might show you domain names that would meet your requirements.
Domain name search results appear as you type. We can do domain lookups very quickly, and usually show domain search results in less than 100 milliseconds. We generate domain names and check .com and many other domain extensions instantly. We use artificial intelligence techniques to find domains for sale that you can buy today and expired domains to backorder. Just start typing!
For example, placing your backorder at NameJet will reveal your interest to other potential buyers so if no other backorders are present you should wait until the last possible moment before the deadline to place your backorder — because if you’re the only backorder, you’ll get it for the minimum $39 bid on expiring names and it won’t go to auction.
Ultimately, I was left with a semi-automated process of scraping sites and running an intricate series of processes to come up with a list of expired domains that I then had to evaluate by hand. This meant I had Majestic and Moz open to check the backlink anchor text and Archive.org to check for obvious spam for every single possible domain. The process was excruciatingly slow and tedious, but absolutely necessary to find domains that would be suitable for building out.
The dropdate for the following TLDs is not verified. Domains might drop earlier or later: .eu .cat .travel .ae .af .as .at .aw .be .bg .bi .bj .bo .bw .cl .co .cx .cz .dk .dm .es .fi .fo .fr .gd .gg .gi .hk .hr .hu .ie .io .iq .ir .je .jp .ki .kz .lt .lu .lv .md .mg .mx .nl .nc .nf .no .nz .pe .pf .pl .pt .ru .sg .si .sm .sn .so .st .su .sx .to .uk .uz .za .berlin .cloud
×