Hi there! Our tech persons suggested us to move our train from main domain to subdomaim, because the search queries for trains are making our website slow. But I am afraid if we move it so subdomain our keywords for train will go down. Do you guys have any suggestiosn about it? Thnaks!
That's a weird suggestion. Any SEO value from your main domain will not carry over to the sub domain. If it's making your site slow, why not run the heavy queries on a different server, while staying on the same domain?