``DWaveCliqueSampler()`` initial embedding slower than I expected

**Description**
This might be a local problem with my system getting old but the initial embedding is taking quite a lot longer than I would have expected, especially on Win OS. In the past it took a couple of minutes, now it is over 5 minutes.
Just raising this in case some change has inadvertently slowed this down.

**To Reproduce**

Win OS:

```
>>> timeit.timeit('from dwave.system import DWaveCliqueSampler; qpu = DWaveCliqueSampler(solver="Advantage_system4.1"); print(qpu.child.solver.name); print(qpu.largest_clique_size)', number=1)
Advantage_system4.1
177
Out[18]: 402.3655947998632

>>> timeit.timeit('from dwave.system import DWaveCliqueSampler; qpu = DWaveCliqueSampler(solver="Advantage_system6
...: .4"); print(qpu.child.solver.name); print(qpu.largest_clique_size)', number=1)
Advantage_system6.4
175
Out[19]: 51.09168740012683
```

Unix:

```
>>> timeit.timeit('from dwave.system import DWaveCliqueSampler; qpu = DWaveCliqueSampler(solver="Advantage_system4.1"); print(qpu.child.solver.name); print(qpu.largest_clique_size)', number=1)
Advantage_system4.1
177
Out[16]: 224.93166744199698
```

**Expected behavior**
I remember a couple of minutes and see [here ](https://docs.dwavequantum.com/en/latest/quantum_research/example_multigate.html#performance-comparison-embedding-time) 152 seconds on Pegasus (which I am guessing was also ``Advantage_system4`` but am not sure)

**Environment:**
- OS: Ubuntu 24, and Win 10
- Python version: 3.12

**Additional context**
Note the large difference between ``Advantage_system4`` and ``Advantage_system6``, perhaps the time is going on the cliques for 176 & 177 nodes?