Very few changes were made to 2.4.7 and none of them should be causing differences like this from 2.4.6. We do a lot of testing before every release and we did not experience this or we wouldn't have released it.
We will look into the issue but we are suspecting it to be caused by limited CPU on some older devices, like yours. We plan on having a low CPU switch in a future release.
Update: Please try all of the things in this article before posting more issues. Also, make sure you are using at least 2.4.8.