Should I use sub-domain for train tickets booking service

Should I use sub-domain for train tickets booking service
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.

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Do you guys have any suggestiosn about it?

Thnaks!

what is loading time of your main website? can you provide your website url to check?

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?

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