@rfc2822 Thanks for the explanation, makes sense! If ICSDroid can’t omit downloading the whole .ics file, wouldn’t a “time limit” at least lighten the burden for creating entries in the Android calendar (and in consequence speed up any application displaying this smaller calendar)?
Forget about my issue : I was tired last night
I had imported the VCF first in thunderbird because I didn’t know yet I could do it in davdroid…
So it was the sogo connector that didn’t import correctly the VCF, not davdroid. I imported the VCF directly form davdroid and it’s OK. Great job and sorry for the noise