Unexpected performance for OpenFileGDB driver compared with PostGIS

I am using GeoTools with OGR plugin to read .gdb data, and I found that the performance is rather horrible:

Test code:

    public static void main(String[] args) throws MalformedURLException {
        String gdb = "/data/x.gdb";

        Map<String, Object> params = new HashMap<>();
        //geotools pg
        params.clear();
        params = new HashMap<>();
        params.put("dbtype", "postgis");
        //other connection string omitted

        //ogr gdb
//        params.clear();
//        params.put("DriverName", "OpenFileGDB");
//        params.put("DatasourceName", new File(gdb).getAbsolutePath());

        try {
            long start = System.nanoTime();
            DataStore dataStore = DataStoreFinder.getDataStore(params);
            SimpleFeatureSource sfs = dataStore.getFeatureSource("Water");
            System.out.println("total count " + sfs.getCount(Query.ALL));
            FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2();
            ReferencedEnvelope bbox = new ReferencedEnvelope(x1,x2,y1,y2, sfs.getSchema().getCoordinateReferenceSystem());
            Filter bboxFilter = ff.bbox(ff.property(sfs.getSchema().getGeometryDescriptor().getLocalName()), bbox);
            Query query = new Query();
            query.setFilter(ff.and(Arrays.asList(bboxFilter)));

            System.out.println("filter count " + sfs.getCount(query));

            long end = System.nanoTime();
            long used = end - start;
            System.out.println("used:" + TimeUnit.NANOSECONDS.toMillis(used) + " ms");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

The test result for OpenFileGDB driver:

total count 821328
filter count 1803
used:11710 ms

Then I exported that data to PG, and got the following result:

total count 821328
filter count 1805
used:1259 ms

PostGIS is much, much better than OpenFileGDB.

Did I miss anything?