I did search around this a lot, but most of the answers tended to be about the previewing, well my jagged text is on my renders.
My zooming is 100% and best quality not draft.
I'm doing a promo video for an app in both landscape and portrait versions. First I did the landscape and text was ok (a bit jagged but tolerable) but when I turned into the portrait the text is is just awfully jagged.
I'm using a Helvetica-bold italic and faux bold. The issue is not the italics cause if I turn it of, the jagged is still on the curves, from the S, for example.
I don't really notice that big of a difference between them really, but I have had issues like that before too. I know the contrast between the text and background will affect how the the anti aliasing looks. higher contrast = more jagged usually. Just an idea but did you use the drop shadow effect or the drop shadow from layer styles? I've had some issues with using layer styles before so try to avoid doing it that way and see if it makes any difference.
I think the portrait looks smoother because the text is larger so the the anti aliasing is less noticeable compared to the text.