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.
{
    WalletBatch batch(*database);
    for (const CScript& script : script_pub_keys) {
        if (!have_solving_data || !::IsMine(*this, script)) { 
            if (!AddWatchOnlyWithDB(batch, script, timestamp)) {
                return false;
            }
        }
        CTxDestination dest;
        ExtractDestination(script, dest);
        if (!internal && IsValidDestination(dest)) {
            SetAddressBookWithDB(batch, dest, label, "receive");
        }
    }
    return true;
}
int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig)