hello how i increase the spawn rate?

{
"Spawn Settings": {
"Spawn near players": true,
"Min pop for near player spawn": 200,
"Min distance from player": 3.0,
"Max distance from player": 10.0,
"Spawn Time": 19.8,
"Destroy Time": 7.3,
"Zombie Settings": {
"Display Name": "Scarecrow",
"Scarecrow Population (total amount)": 15500,
"Scarecrow Health": 200.0,
"Scarecrow Kits": [] 

i have try this ^^ but i only get 3 at the same time ^^. i dont want 15500  ^^, but more than 3 like 10 or someting :). thanks, good work.

You have set the "min pop for near player spawn" to 200, meaning zombies will only spawn exclusively near to players when the server has 200 or more players. Also I would recommend increasing the distances since 3 is basically in front of their face (about 1 foundation), also 15,500 zombies is a huge number of zombies to have running around on your server at once.

ah okay ^^ now i have understand all. Thank you very much :), yeah 15,500 is to huge  (server performance i think:D ^^).