Default python compression level (11) causes more delay than it's worth on larger files

[mudinthewater]

Using a 7314288 byte (~7MB) json file as an example:

The image is kinda blown out, so here's the raw data:

Quality	Compression Time	Size
0	0.011061668	287292
1	0.009209156	213457
2	0.018366814	184692
3	0.01734972	184569
4	0.023967743	177295
5	0.037658453	151161
6	0.042690992	150042
7	0.054255962	148143
8	0.072593212	147667
9	0.108716726	146448
10	1.435314894	130876
11	20.70757484	122797

I understand the desire to have the library put its highest compression quality out there first, but wouldn't it create an overall better impression on users if a faster default was used? Quality 8 provides nearly as good a result as 11, but it's almost 300 times faster.