How do I fix the timer?

Hello, I checked all possibilies I know and it doesn't work I've found help in the "frequently added question" but it doesn't work.

I made a game where enemies appears after 5, 10, 15s

Then I realized the timer couldn't be modify so I rebuilt the game with a fake timer (a variable)

I have:

System: Every 1s => Add 1 to "Variable Timer"

System: "Variable Timer" = 5 => Creat my object

System: "Variable Timer" = 10 => Creat my object

System: "Variable Timer" = 15 => Creat my object

When I do that, it works, but I have like 9999 objects being created and the game get massive lag, why?

I imagine the timer getting 0, 1, 2, 3 ... and it does works, but why so many objects ? Is it because there is many "ticks" during a second?

I have the possibily to change the variable to "= > <, etc" , my logic suggest I must use "=" to make only one object... Maybe add another condition

How do I fix that please? (I'm sure this is a stupid command but I can't figure it out )

EDIT: I'm stupid! I'm looking for special conditions and I see

"trigger once while true", Just add this condition and the problem is solved!

Hi foxmaster "Trigger once while true" should do it

Hi foxmaster "Trigger once while true" should do it

Thank you dude I ve just seen the option immediatly when I posted.., ridiculous , ridiculous!!! *cover his face with something*

You can use the Timer behaviour also.