puffy ~/work> time urxvtc -e ksh -c exit 
    0m00.05s real     0m00.01s user     0m00.00s system
puffy ~/work> time urxvt -e ksh -c exit  
    0m00.18s real     0m00.13s user     0m00.05s system
puffy ~/work> time st -e ksh -c exit    
    0m00.25s real     0m00.18s user     0m00.07s system
puffy ~/work> time xterm  -e ksh -c exit
    0m00.30s real     0m00.13s user     0m00.09s system
puffy ~/work> time mlterm  -e ksh -c exit
    0m00.21s real     0m00.08s user     0m00.10s system
puffy ~/work> time sakura  -e ksh -c exit 

(sakura:33064): VTE-WARNING **: 11:06:25.408: (../vte-0.60.3/src/vtegtk.cc:2ntime check failed: (_vte_regex_has_multiline_compile_flag(regex))

(sakura:33064): VTE-WARNING **: 11:06:25.410: (../vte-0.60.3/src/vtegtk.cc:2ntime check failed: (_vte_regex_has_multiline_compile_flag(regex))
    0m00.50s real     0m00.27s user     0m00.14s system
puffy ~/work>