diff --git a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
index 453f504..cd83361 100644
--- a/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
+++ b/pdb-plotting/src/main/java/org/lucares/recommind/logs/Plotter.java
@@ -29,8 +29,12 @@ import org.lucares.pdb.plot.api.PlotSettings;
 import org.lucares.performance.db.FileUtils;
 import org.lucares.performance.db.Grouping;
 import org.lucares.performance.db.PerformanceDb;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Plotter {
+	private static final Logger LOGGER = LoggerFactory.getLogger(Plotter.class);
+	private static final Logger METRICS_LOGGER = LoggerFactory.getLogger("org.lucares.metrics.plotter");
 
 	private final PerformanceDb db;
 	private final Path tmpBaseDir;
@@ -134,6 +138,8 @@ public class Plotter {
 			while (dataSeries.size() > plotSettings.getLimit()) {
 				dataSeries.remove(plotSettings.getLimit());
 			}
+		} else {
+			dataSeries.sort(getDataSeriesComparator(Limit.MOST_VALUES));
 		}
 
 	}
@@ -184,7 +190,7 @@ public class Plotter {
 				plotSettings.setGroupBy(Grouping.NO_GROUPING);
 
 				final File image = plotter.plot(plotSettings);
-				System.out.println("plotted image: " + image);
+				LOGGER.trace("plotted image: {}", image);
 			}
 
 		} finally {
@@ -225,7 +231,7 @@ public class Plotter {
 			}
 		}
 
-		System.out.println("wrote " + count + " values to csv in: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+		METRICS_LOGGER.debug("wrote {} values to csv in: {}ms", count, (System.nanoTime() - start) / 1_000_000.0);
 		return new CsvSummary(count, maxDate, minDate);
 	}
 }
diff --git a/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java b/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
index 6177d5e..6806005 100644
--- a/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
+++ b/pdb-ui/src/main/java/org/lucares/pdbui/PdbController.java
@@ -17,6 +17,8 @@ import org.lucares.pdbui.domain.PlotResponse;
 import org.lucares.performance.db.CollectionUtils;
 import org.lucares.recommind.logs.InternalPlottingException;
 import org.lucares.recommind.logs.Plotter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.http.MediaType;
 import org.springframework.stereotype.Controller;
@@ -31,6 +33,8 @@ import org.springframework.web.bind.annotation.ResponseBody;
 @EnableAutoConfiguration
 public class PdbController implements HardcodedValues, CollectionUtils {
 
+	private static final Logger LOGGER = LoggerFactory.getLogger(PdbController.class);
+
 	private final Plotter plotter;
 	private final PdbRepository db;
 
@@ -53,7 +57,9 @@ public class PdbController implements HardcodedValues, CollectionUtils {
 
 		final Path relativeImagePath = plotter.getOutputDir().relativize(image.toPath());
 		final String relativeImgUrl = relativeImagePath.toString().replace('\\', '/');
-		return new PlotResponse(WEB_IMAGE_OUTPUT_PATH + "/" + relativeImgUrl);
+		final String imageUrl = WEB_IMAGE_OUTPUT_PATH + "/" + relativeImgUrl;
+		LOGGER.trace("image url:  {}", imageUrl);
+		return new PlotResponse(imageUrl);
 	}
 
 	@RequestMapping(path = "/autocomplete", //