vspedr

Problem:
I experienced Spotify being stuck in full screen mode. 
The title bar with minimize, maximize and close wasn't present and no keyboard shortcut I know about would exit full screen.

Solution
rm ~/snap/spotify/current/.config/spotify/prefs

Works both in 18.04.01 and 20.04.x

Source:

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs