(I edited my first message: it take 20 seconds.)
First i'd just enabled voice menu but being french i would like french voice, so i installed "ScanSoft Virginie_Dri40_16kHz " and i used rockbox utiliry to create voice file.
I used default encoder settings, i just selcted "french" and virginie voice in TTL settings.
So, an file named francais.voice has been created, its size is about 2MB.
I don't need anymore the english.voice file so i deleted it.
I use 2 config files, the first named "N" with voice disabled, the second named "V" with voice enabled.
If i load "N" then reboot my clip, then i load "V", there is no waiting.
But if my clip boot directly on "V", there is waiting.
For testing i deleted my francais.voice file and reinstalled only english.voice with rbutility, then i change my language to english to enable voice:
I have the same problem, soit isn't a probleme with my own voice file.