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Your website has a lot of issues according to google pagespeed insight. https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fwww.houseshop18.com%2F&tab=desktop Apart from the eliminating render blocking CSS+JS, optimizing images, set expire headers for all assets you need to improve server response time. Currently your server is ...
According to Pingdom tools (http://tools.pingdom.com/) the size of your files is ok, i think it's all about your admin-ajax.php Try with wordpress hyper cache plugin.
As for such a huge traffic, I highly suggest vps hosting. On average, this kind of hosting type is around $50 a month for really reliable one (you can get some best recommendations from bestvps.com). It may be a little bit costly for you, but for the sake of future growth and website performance, I think this price is worthy.
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