client.add() stuck

i have a directory Data which looks like this:
Data/
├─ subfolder/
│ ├─ B.html x 5000
├─ A.html
with A about 4 mb and 5000 files B each 4kb large.

when i add it with the command line (ipfs add .\Data\ -r) it takes about 10 seconds to add.
when i try to add it with you libary (client.add("Data",recursive=True)) it is still running after 5 minutes.
running go-ipfs v0.7.0 localy on a windows host
if you need more information let me know