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.
{
    if (!IsDummy()) {
        env->Flush(shutdown);
        if (shutdown) {
            LOCK(cs_db);
            g_dbenvs.erase(env->Directory().string());
            env = nullptr;
        } else {
            
            
            
            
            
            env->m_fileids.erase(strFile);
        }
    }
}
void BerkeleyDatabase::ReloadDbEnv()
{
    if (!IsDummy()) {
        env->ReloadDbEnv();
    }
}