import bpy
import time

OBJECT_NUMBER = 100_000
collection = bpy.context.collection


def objects_create():
    objects = []
    new = bpy.data.objects.new
    for i in range(OBJECT_NUMBER):
        obj = new(str(hash(hex(i))), None)
        objects.append(obj)
        if (i % 1_000) == 0:
            print(i)
    return objects


def objects_collection_link(collection, objects):
    timer_start = time.time()
    link = collection.objects.link
    for ob in objects:
        link(ob)
    time_delta = time.time() - timer_start
    print("Time to link objects into scene:", len(objects), time_delta)


def objects_collection_unlink(collection, objects):
    timer_start = time.time()
    unlink = collection.objects.unlink
    # Reversed (worst case).
    # without this unlinking is very fast even without optimizations.
    for ob in reversed(list(objects)):
        unlink(ob)
    time_delta = time.time() - timer_start
    print("Time to unlink:", len(objects), time_delta)


objects = objects_create()
objects_collection_link(collection, objects)
for ob in objects:
    ob.select_set(True)
objects_collection_unlink(collection, objects)