Skrypt na skiny

Witam,

zrobiłem skrypt, polegający na tym że jak osoba kliknie w npc, pojawia jej się gui z główkami. Wybiera którą chcę, i wykonuje się komenda /skin <nazwa skina>. Dodatkowo chciałem że jak ktoś ma nick Tomaszek123 to będzie napis "SKin chłopaka"... Oto kod:

on load:
    clear {skin::*}
    add "Tidzimi" to {skin::*}
    add "Roxmb" to {skin::*}
    add "Dream" to {skin::*}
    add "022Stefania" to {skin::*}
    add "dreamstar22" to {skin::*}
    add "DaDragonBro" to {skin::*}
    add "Doknes" to {skin::*}
    add "Herobrine" to {skin::*}
    add "standdouble1" to {skin::*}
    add "_YouTube_" to {skin::*}
    add "GoldCop" to {skin::*}
    add "Santa" to {skin::*}
    add "Nexe333" to {skin::*}
    add "Aquarius_ScN" to {skin::*}
    add "Pikachu" to {skin::*}
    add "waflooowy" to {skin::*}
    add "TobiaszGaming" to {skin::*}
    
on right click on player:
    name of clicked player is "&aWybierz skina"
    set {_gui} to chest with 3 rows named "&aWybierz skina:"
    set slot 0 of {_gui} to  skull of "Tidzimi" parsed as offline player named "&aSkin: &2Tidzimi"
    set slot 1 of {_gui} to skull of "Roxmb" parsed as offline player named "&aSkin: &2RoxMb"
    set slot 2 of {_gui} to skull of "Dream" parsed as offline player named "&aSkin: &2Dream"
    set slot 3 of {_gui} to skull of "022Stefania" parsed as offline player named "&aSkin: &dDziewczyny"
    set slot 4 of {_gui} to skull of "dreamstar22" parsed as offline player named "&aSkin: &eKanapki"
    set slot 5 of {_gui} to skull of "DaDragonBro" parsed as offline player named "&aSkin: &bKaczora Donalda"
    set slot 6 of {_gui} to skull of "Doknes" parsed as offline player named "&aSkin: &1Doknes"
    set slot 7 of {_gui} to skull of "Herobrine" parsed as offline player named "&aSkin: &fHerobrine"
    set slot 9 of {_gui} to skull of "standdouble1" parsed as offline player named "&aSkin: &6Chłopaka"
    set slot 10 of {_gui} to skull of "_YouTube_" parsed as offline player named "&aSkin: &cYouTube"
    set slot 11 of {_gui} to skull of "GoldCop" parsed as offline player named "&aSkin: &6Król"
    set slot 12 of {_gui} to skull of "Santa" parsed as offline player named "&aSkin: &4Mikołaja"
    set slot 13 of {_gui} to skull of "Nexe333" parsed as offline player named "&aSkin: &9Nexe"
    set slot 14 of {_gui} to skull of "Aquarius_ScN" parsed as offline player named "&aSkin: &6&lNorbiros"
    set slot 15 of {_gui} to skull of "Pikachu" parsed as offline player named "&aSkin: &ePikachu"
    set slot 16 of {_gui} to skull of "waflooowy" parsed as offline player named "&aSkin: &6&lwafloowy"
    set slot 18 of {_gui} to skull of "TobiaszGaming" parsed as offline player named "&aSkin: &8TobiaszGaming"
    set slot 8 of {_gui} to structure block named "&8Wyczyść &7Skina"
    set slot 17 of {_gui} to barrier named "&c&lZamknij menu"
    set slot 26 of {_gui} to command block named "&8Odśwież &7Skin" with lore "&5Tylko dla kont premium!"
    open {_gui} to player


on inventory click:
    event-inventory is not player's inventory
    if name of event-inventory is "&aWybierz skina:":
        cancel event
        if clicked slot is 8:
            execute player command "skin clear"
            close player's inventory
            stop
        if clicked slot is 17:
            close player's inventory
            stop
        if clicked slot is 26:
            execute player command "skin update"
            close player's inventory
            stop
        if type of clicked slot is air:
            stop
        set {_item} to clicked slot
        set {_item} to "%{_item} + 1%" parsed as number
        if {_item} is more than 8:
            remove 1 from {_item}
        if {_item} is more than 17:
            remove 1 from {_item}
        set {_item} to "%{skin::%{_item}%}%"
        execute player command "skin set %{_item}%"
        close player's inventory

I teraz jest problem. Gdy klikne 1 raz po wbiciu. Przez około 10 sekund, zatrzymuje serwer, tps spada to 17, nie otwiera. Potem otwiera się ekwipunek. A potem już wszystko normalnie działa do otwierania. I czemu tylko za 1 razem laguje? Jest ktoś wstanie mi wytłumaczyć? I powiedzieć jak naprawić?

A i wiem że kod brzydko napisany, ale pisałem na szybko, i nie miałem czasu