Investigate memory leaks

[louh]

TODO.

Resources:

• https://developers.google.com/web/tools/chrome-devtools/memory-problems/
• https://www.ibm.com/developerworks/library/wa-memleak/
• https://auth0.com/blog/four-types-of-leaks-in-your-javascript-code-and-how-to-get-rid-of-them/