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.
{
    dbenv.reset(new DbEnv(DB_CXX_NO_EXCEPTIONS));
    fDbEnvInit = false;
    fMockDb = false;
}
BerkeleyEnvironment::BerkeleyEnvironment(const fs::path& dir_path) : strPath(dir_path.string())
{
    Reset();
}
BerkeleyEnvironment::~BerkeleyEnvironment()
{
    LOCK(cs_db);
    g_dbenvs.erase(strPath);
    Close();
}
bool BerkeleyEnvironment::Open(bool retry)
{
    if (fDbEnvInit)
        return true;
    boost::this_thread::interruption_point();
    fs::path pathIn = strPath;
    TryCreateDirectories(pathIn);
    if (!LockDirectory(pathIn, ".walletlock")) {