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.
{
    
    CWallet* pwallet = wallet.get();
    {
        LOCK(g_wallet_release_mutex);
        auto it = g_unloading_wallet_set.insert(pwallet);
        assert(it.second);
    }
    
    
    
    pwallet->NotifyUnload();
    
    wallet.reset();
    {
        WAIT_LOCK(g_wallet_release_mutex, lock);
        while (g_unloading_wallet_set.count(pwallet) == 1) {
            g_wallet_release_cv.wait(lock);
        }
    }
}
std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, std::string& error, std::string& warning)