Form submit in modal causes a hard page refresh with the cached version of the page not showing in the background

[i108]

I have a form in a modal popup where the background is greyed out in a lightbox effect.

Upon submission in mobile safari the cached version of the page is retained until the new page replaces it. However, under turbolinks-ios there is a visible delay in the old page being replaced by the new one.

Any pointers on what steps I could take to change this behavior or minimize delay when running under turbolinks-ios would be appreciated.