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.
{
        nVersion = CKeyMetadata::CURRENT_VERSION;
        nCreateTime = 0;
        hdKeypath.clear();
        hd_seed_id.SetNull();
        key_origin.clear();
        has_key_origin = false;
    }
};
/** Access to the wallet database.
 * Opens the database and provides read and write access to it. Each read and write is its own transaction.
 * Multiple operation transactions can be started using TxnBegin() and committed using TxnCommit()
 * Otherwise the transaction will be committed when the object goes out of scope.
 * Optionally (on by default) it will flush to disk on close.
 * Every 1000 writes will automatically trigger a flush to disk.
 */
class WalletBatch
{
private:
    template <typename K, typename T>
    bool WriteIC(const K& key, const T& value, bool fOverwrite = true)