i3ipc is twice as slow as runnig swaymsg -t get_tree and parsing the json

[josch]

Hi,

the following is tested on Debian unstable with i3ipc 2.2.1:

$ time python3 -c 'import json; import subprocess; data = json.loads(subprocess.check_output(["swaymsg", "-t", "get_tree"]))'

real	0m0.155s
user	0m0.137s
sys	0m0.016s
$ time python3 -c "import i3ipc; i3ipc.Connection().get_tree()"

real	0m0.333s
user	0m0.297s
sys	0m0.033s

I think this is a bug. Spawning a subprocess and parsing its output should not be faster than using a dedicated library to do the job. And it should definitely not be twice as fast as using the library.