matplotlib taking time when being imported

As tom suggested in the comment above, deleting the files:

fontList.cache
fontList.py3k.cache 
tex.cache 

solve the problem.
In my case the files were under:

`~/.matplotlib`

EDITED

A couple of days ago the message appeared again, I deleted the files in the locations mention above without any success. I found that as suggested here by T Mudau there’s an extra location with text cache files is: ~/.cache/fontconfig

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