Hi,
No, your loading time is bad. You should find a way to improve it. You can't launch the website with this state (unless you don't care about website speed)
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You should drop the "Server response time" somewhere between 0.75-1.5 seconds. Currently it is 4.5 seconds.
Server response time is the time passes until your server process the PHP and render the page (doesn't include any loading time for static contents - CSS, JS or graphics)
I would recommend you to enable the "Joomla Cache" (but i assume you have already done that)
If the "cache" is already enabled, then there is no other way but to find a stronger hosting. If you are using a Shared Hosting package, you are out of luck, this slowness is normal. You need at least VPS with at least 1gb dedicated RAM to run SportMart smoothly.
SportMart is not a simple template. It has very complex queries. Thus, requires strong server.
In our live demo:
demo.flexiblewebdesign.com/sportmart/index.php
Our server is VPS with 4gb dedicated RAM. And the server response time (with cache enabled) is around 0.8-1 seconds.
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Hosting companies i would recommend:
InmotionHosting:
www.inmotionhosting.com/vps-hosting (Our live demo's hosting company, package: VPS-1000S)
Bluehost:
www.bluehost.com/vps
These are the top 2s. But of course there are other hosting companies. Use google.com to find the most appropriate hosting for yourself (high performance, low price).
Regards.