Establish network connections early improves perceived page speed
for that, just add a preconnect to your TwicPics domain in the header of your pages :
<link rel="preconnect" href="https://<my-subdomain>.twic.pics">
The preconnect informs the browser that your page intends to establish a connection to another domain, and that you'd like the process to start as soon as possible. Resources will load more quickly because the setup process has already been completed by the time the browser requests them.
