test my web regarding load time with Pingdom.com

I test my web regarding load time with Pingdom.com
I get the following problems:
Is there anything that you can offer to cope that?
Thx

Regarding joining javascript files(I paste only small amount of lines as an example):

There are 26 JavaScript files served from triplebit.com. They should be combined into as few files as possible.
http://triplebit.com/rihut-mashlim/?wc-ajax=get_refreshed_fragments
http://triplebit.com/rihut-mashlim/wp-content/p … ojo-accessibility/assets/js/app.min.js?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … der-animation/assets/js/scripts.min.js?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/plugins/pojo-forms/assets/js/app.min.js?ver=4.5.3

and also other things…
This page makes 66 parallelizable requests to triplebit.com. Increase download parallelization by distributing these requests across multiple hostnames:
http://triplebit.com/rihut-mashlim/wp-content/p … ryo-widget-device/assets/css/style.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … accessibility/assets/css/style.min.css?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … ojo-accessibility/assets/js/app.min.js?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … uilder-animation/assets/css/styles.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … der-animation/assets/js/scripts.min.js?ver=4.5.3

There are 18 CSS files served from triplebit.com. They should be combined into as few files as possible.
http://triplebit.com/rihut-mashlim/wp-content/p … ryo-widget-device/assets/css/style.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … accessibility/assets/css/style.min.css?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … uilder-animation/assets/css/styles.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … wipe/default-skin/default-skin.min.css?ver=4.5.3

Resources with a “?” in the URL are not cached by some proxy caching servers. Remove the query string and encode the parameters into the URL for the following resources:
http://triplebit.com/rihut-mashlim/wp-content/p … ryo-widget-device/assets/css/style.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … accessibility/assets/css/style.min.css?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … ojo-accessibility/assets/js/app.min.js?ver=1.0.0
http://triplebit.com/rihut-mashlim/wp-content/p … uilder-animation/assets/css/styles.css?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/p … der-animation/assets/js/scripts.min.js?ver=4.5.3
http://triplebit.com/rihut-mashlim/wp-content/plugins/pojo-forms/assets/js/app.min.js?ver=4.5.3