To start with,

• There are 8(!) Google Adsense banners on your homepage. Each one loads images, animations and javascript.
• There are 5 giant (2400px wide) images inn your welcome block, force-resized to a small 460px wide container, with some animation on top.
• There's a 2.7Mb animated Gif that doesn't do anything

Consider how you can reduce the above. At this stage most of the payload on the homepage isn't even coming from UNA and there is nothing you can do in server config to make things faster. The page loads huge amount of JS, unoptimised media assets and overall DOM is overwhelming for a browser as a result.