Pages load without theme during first 0.5 second

Hello -

I don't know whether it's related to the fact that Fblike has not been released in Full version for 5.X (now it's a Development snapshot), but when I load pages, they often load first without the Theme being applied for 0.5 seconds (so white page, text without any styling: black text/left side) and after that the Theme works...

Is this a bug in the Theme or on my end (settings)?

When will the Full version be reviewed/released?

Thanks!