This support ticket is created 7 years, 2 months ago. There's a good chance that you are reading advice that it now obsolete.
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Thank you for contacting Toolset support. Can you please tell us where exactly it loads this twice, any screenshot or filename or line number where you see double ajax call?
I have tried to reproduce this issue at my local site, but I can confirm you that there is only one admin-ajax.php file loading.
Please provide temporary access (WP-Admin and FTP Login info) to your site (preferably staging site), so that I can look into your setup and check the issue.
Your next answer will be private which means only you and I have access to it.
=== Please backup your database and website ===
✙ I would additionally need your permission to de-activate and re-activate Plugins and the Theme, and to change configurations on the site. This is also a reason the backup is really important.
✙ Please add the screenshot or link where you see admin-ajax.php loading twice.
These are just placed to do different actions and this does not directly affect the speed, these are variables placed so that it can be used as needed by Views and other plugins. We have not seen any speed complaints because of this, and removing those might not be a good idea. The compressed version or cached version that you were loading previously may help in your case.