invalid command name "text"
    while executing
"text .t"
    (in namespace eval "::request" script line 6)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
#!/home/moumou/TclTk-8.5/bin/wish8.5

set Nc 500
set Nl 500
set toto [string repeat "[string repeat X $Nc]\n" $Nl]
pack [text .t]
.t insert end $toto
for {set l 0 ; set il 1} {$l < $Nl} {incr l; incr il} {
    for {set c 0} {$c < $Nc} {incr c 3} {
	lappend LT "$il.$c"
    }
}
.t tag configure Tex -foreground white -background green
update idletasks
puts "N tags [llength $LT]"
puts "[time {eval [list .t tag add Tex] $LT}]"
.t tag remove Tex 1.0 end
update idletasks
puts "[time {.t tag add Tex {*}$LT}]"

exit