Performing the following (note the range of 10,000):

`importmulti '[{"desc": "sh(wpkh([aeee1e6a/49h/1h/0h]tpubDC5bVdaveQYxGFztMShFAjU637kKjrs9FD8ne1oHR7z8tLeQJExsaxWRVeSpcCcYMdp5ecf2LQhuVaeYFZ7YEpvWTJr4nDGUJrmuvLuTSsp/1/*))", "keypool": true, "timestamp": "now", "watchonly": true, "internal": true, "range": {"end": 1000}}]' '{"rescan": false}'`

takes many minutes. @achow101 reports a similar import taking 6 minutes on his machine.
{
        AssertLockHeld(cs_wallet);
        return setInternalKeyPool.size() + setExternalKeyPool.size();
    }
    
    void SetMinVersion(enum WalletFeature, WalletBatch* batch_in = nullptr, bool fExplicit = false);
    
    bool SetMaxVersion(int nVersion);
    
    int GetVersion() { LOCK(cs_wallet); return nWalletVersion; }