Blender addon Memory Test

bl_info = {
    "name": "Memory zebus",
    "author": "zebus3d",
    "version": (1, 0),
    "blender": (2, 80, 0),
    "location": "",
    "description": "Memory test",
    "warning": "",
    "wiki_url": "",
    "category": "Add Mesh",
}

import bpy
from bpy.types import Operator
from bpy.props import IntProperty
from bpy_extras.object_utils import AddObjectHelper, object_data_add


def duplicate_test_memory(repeat, ob):
    for i in range(repeat):
        bpy.ops.object.duplicate()
    # remove all except ob:
    bpy.ops.object.select_all(action='SELECT')
    ob.select_set(False)
    bpy.ops.object.delete(use_global=False)
    # remove orphan meshes:
    for mesh in bpy.data.meshes:
        if mesh.users < 1:
            print(mesh.name, " Mesh with 0 users, procced to delete")
            bpy.data.meshes.remove(mesh)


class BUTTON_OT_Memory_test(bpy.types.Operator):
    bl_label = "Memory Test"
    bl_idname = "m.test"
    bl_description = "Memory Test"

    def execute(self, context):
        ob = bpy.context.active_object
        repeat = context.scene.Repeat
        if ob:
            for i in range(repeat):
                duplicate_test_memory(repeat, ob)
        else:
            bpy.ops.mesh.primitive_cube_add(size=2, enter_editmode=False, location=(0, 0, 0))
            ob = bpy.context.active_object
            for i in range(repeat):
                duplicate_test_memory(repeat, ob)

        return {'FINISHED'}


class OBJECT_PT_duplicate_remove_object(bpy.types.Panel):
    bl_idname = "OBJECT_PT_duplicate_remove_object"
    bl_label = "Duplicate and remove object"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Memory Test"


    def draw(self, context):
        scn = bpy.context.scene
        layout = self.layout
        col = layout.column(align=True)
        #
        row = col.row(align=True)
        rs = row.split(factor=0.8, align=True)
        #
        col.prop(context.scene, 'Repeat', text='Repeat')
        col.operator("m.test", text="Memory Test")



classes = (BUTTON_OT_Memory_test, OBJECT_PT_duplicate_remove_object)


# Registration
def register():
    from bpy.utils import register_class

    bpy.types.Scene.Repeat = bpy.props.IntProperty(name="Repeat", default=100, min=1)

    for cls in classes:
        register_class(cls)


def unregister():
    from bpy.utils import unregister_class

    del bpy.types.Scene.Repeat

    for cls in classes:
        unregister_class(cls)


if __name__ == "__main__":
    register()