In [8]: def t1(l):
   ...:     for i in range(10000):
   ...:         l = attr.evolve(l, instance_name=f"titi {i}")
   ...:     return l


In [12]: %timeit t1(l, 10000)
105 ms ± 2.75 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)

In [14]: def t2(l, n):
    ...:     ld = attr.asdict(l)
    ...:     for i in range(n):
    ...:         ld["instance_name"] = f"titi {i}"
    ...: 
    ...:     return Lister(**ld)
In [15]: %timeit t2(l, 10000)
1.21 ms ± 35.2 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)