Yes the new version is much faster as we replace some modules or built in libs with our own optimized code which added more than 200% faster.
You can always apply upgrades to the code files only and do not upgrade the templates, widgets, or language files, this way you stay able to upgrade to latest versions. Anyway, some upgrades adds changes to the database or new sql tables which has to be applied in order they released, if you use the Liveupdate tool in your admin, download, extract, then see a bunch of files under upgrade scripts, you can apply them in the order their names shows, before anything do full site backup. Of course if your budget allows we can do it but it will cost you, if you are interested email us. If you stay without upgrades then after a year you will not be able to use the new products/versions, this is one of the reason we added the Liveupdate tool in the admin to make the upgrade easy for anyone. Thank you
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