Hi Ralf,
Yes, that is how the transferCookie system works for security
reasons. If you'd like to avoid the performance impact, the best way
is to actually upload your content proactively, storing the ID/Access
Key pairs for each document in a database table. You can then render
the getDoc embed code using those identifiers for authenticated users.
Best,
Jared
Jared Friedman
CTO, Scribd
m: 646-296-0973