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.
{
            boost::this_thread::interruption_point();
            std::map<std::string, int>::iterator mi = env->mapFileUseCount.find(strFile);
            if (mi != env->mapFileUseCount.end())
            {
                LogPrint(BCLog::DB, "Flushing %s\n", strFile);
                int64_t nStart = GetTimeMillis();
                
                env->CloseDb(strFile);
                env->CheckpointLSN(strFile);
                env->mapFileUseCount.erase(mi++);
                LogPrint(BCLog::DB, "Flushed %s %dms\n", strFile, GetTimeMillis() - nStart);
                ret = true;
            }
        }
    }
    return ret;
}
bool BerkeleyDatabase::Rewrite(const char* pszSkip)
{
    return BerkeleyBatch::Rewrite(*this, pszSkip);
}
bool BerkeleyDatabase::Backup(const std::string& strDest)
{
    if (IsDummy()) {
        return false;
    }
    while (true)
    {
        {