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 (ret != 0) {
        LogPrintf("BerkeleyEnvironment::Open: Error %d opening database environment: %s\n", ret, DbEnv::strerror(ret));
        int ret2 = dbenv->close(0);
        if (ret2 != 0) {
            LogPrintf("BerkeleyEnvironment::Open: Error %d closing failed database environment: %s\n", ret2, DbEnv::strerror(ret2));
        }
        Reset();
        if (retry) {
            
            fs::path pathDatabaseBak = pathIn / strprintf("database.%d.bak", GetTime());
            try {
                fs::rename(pathLogDir, pathDatabaseBak);
                LogPrintf("Moved old %s to %s. Retrying.\n", pathLogDir.string(), pathDatabaseBak.string());
            } catch (const fs::filesystem_error&) {
                
            }
            
            if (!Open(false )) {
                
                return false;
            }
        } else {
            return false;
        }
    }
    fDbEnvInit = true;
    fMockDb = false;
    return true;
}
BerkeleyEnvironment::BerkeleyEnvironment()