It's crucial to use alt tag and to make sure search engines know what you are talking about.
Domain is either you or your company's ID in the Internet, when you apply to connect to Internet, they will give you protocol number. Every device connected to Internet has an IP number.
For testing your website speed just put in console ping
Older domains usually have been crawled a higher number of times by search engine crawlers and other bots.
Site Page Views User Information : The age of the domain shows how long it has been since the name was registered by its current owner.