the kivymd app freezes when adding a large number of widgets

Question

When I try to add add many widgets to MDList, the app freezes. Can I update gui after every widget I add? Is it possible to add widgets without freezing?

from kivy.lang import Builder
from kivy.properties import ObjectProperty
from kivymd.app import MDApp
from kivymd.uix import Screen
from kivymd.uix.button import MDRaisedButton
from kivymd.uix.list import OneLineIconListItem
kv = '''
ScreenManager:
    id: screen_mng
    Screen:
        name: 'scr 1'
        Button_:
            screen_mng: screen_mng
            text: 'scr 2'
            on_release:
                screen_mng.current = 'scr 2'
    Screen_:
        list: container_
        name: 'scr 2'
        on_pre_enter: self.load_items()
        ScrollView:
            MDList:
                id: container_'''

class Button_(MDRaisedButton):
    screenmanager = ObjectProperty()

class Screen_(Screen):
    list = ObjectProperty()

    def load_items(self):
        for i in range(100):
            item = OneLineIconListItem(text=str(i))
            self.list.add_widget(item)

class Test(MDApp):
    def build(self):
        return Builder.load_string(kv)

app = Test()
app.run()

If I use multithreading, nothing changes, the app still freezes

def load_items(self):
    Thread(target=self._load_items).start()

def _load_items(self):
    for i in range(100):
        item = OneLineIconListItem(text=str(i))
        self.list.add_widget(item)

Help please

Answer 1

Thank you to everyone who commented on my question, I did everything I needed to do.

from kivy.lang import Builder
from kivy.properties import ObjectProperty, StringProperty
from kivymd.app import MDApp
from kivymd.uix import Screen
from kivymd.uix.button import MDRaisedButton
from kivymd.uix.list import OneLineIconListItem
from kivy.uix.recycleview import RecycleView

kv = '''
<ListItem>:
    IconLeftWidget:
        icon: root.icon

<RV>:

    viewclass: 'ListItem'
    RecycleBoxLayout:
        default_size: None, dp(56)
        default_size_hint: 1, None
        size_hint_y: None
        height: self.minimum_height
        orientation: 'vertical'
<Screen_>:
    BoxLayout:
        Button_:
            text: 'update'
            on_release: rv.update()
        RV:
            id: rv


ScreenManager:
    id: screen_mng
    Screen:
        name: 'scr 1'
        Button_:
            screen_mng: screen_mng
            text: 'scr 2'
            on_release:
                screen_mng.current = 'scr 2'
    Screen_:
        name: 'scr 2'

'''


class Button_(MDRaisedButton):
    screenmanager = ObjectProperty()

class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.update()

    def update(self):
        self.data = [{'type': i, 'arg': i**2, 'text': str(i + 1)} for i in range(100)]



class ListItem(OneLineIconListItem):
    icon = StringProperty()

    def __init__(self, type=None, arg=None, **kwargs):
        super().__init__(**kwargs)
        self.arg = arg
        self.type = type
        self.icon = self.__return_icon()

    def __return_icon(self):
        self.type = 'android'
        return 'android'


class Screen_(Screen):
    list = ObjectProperty()

    def load_items(self):
        self.list.update()

class Test(MDApp):
    def build(self):
        return Builder.load_string(kv)


app = Test()
app.run()