zoqaeski

// $XDG_CONFIG_HOME/xkb/symbols/custom

// Makes ALT + CAPS_LOCK act as 3rd level switch
// Works sporadically
partial modifier_keys
xkb_symbols "alt_caps_mode_switch" {
    key <CAPS> {
		type[Group1]="PC_ALT_LEVEL2",
		[       Caps_Lock,    ISO_Level3_Shift       ]
    };

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD