diff --git a/analyze_batch.py b/analyze_batch.py
index a1ba451..02b4d87 100644
--- a/analyze_batch.py
+++ b/analyze_batch.py
@@ -20,7 +20,11 @@ def main(folder, intervl):
     users, posts, firstcontrib, sumcontrib = load(folder)
 
     intervals = calc_intervals(posts, intervl)
+
+    start = cms()
+    printnoln("reading sentiments ...")
     cachedsentiments = imprt(folder + "/output/sentiments.py").answers
+    rprint("reading sentiments ... took " + str(cms() - start) + "ms")
 
     outputdir = folder + "/output/batch/"
     os.system("mkdir -p " + outputdir)
@@ -100,9 +104,9 @@ def main(folder, intervl):
             gcom.append(comlevelsflat)
 
             fig, axs = plt.subplots(2, 2, figsize=(16, 12))
-            axs[0, 0].set_title('Neg')
-            axs[1, 0].set_title('Neu')
-            axs[0, 1].set_title('Pos')
+            axs[0, 0].set_title('Negativity')
+            axs[1, 0].set_title('Neutrality')
+            axs[0, 1].set_title('Positivity')
             axs[1, 1].set_title('Compound')
             axs[0, 0].hist(neglevelsflat, np.linspace(0, 1, 1 * 100))
             axs[1, 0].hist(neulevelsflat, np.linspace(0, 1, 1 * 100))
@@ -115,7 +119,7 @@ def main(folder, intervl):
 
             # plt.show()
             fig.suptitle("Sentiment of answers to the first " + str(option_posts) + " (max) posts within 1 week of 1st contribution\nPosts created between "
-                         + option_date_from.strftime("%d-%m-%Y") + " to " + option_date_to.strftime("%d-%m-%Y"))
+                         + option_date_from.strftime("%d-%m-%Y") + " to " + option_date_to.strftime("%d-%m-%Y") + ", n=" + str(len(filteredposts)))
             # figsaver.save(fig, outfilename + ".png", bbox_inches='tight')
             printnoln("\rcomputing toxic levels: post " + str(len(filteredposts)) + "/" + str(len(filteredposts)) + " ... plotting ... saving ...")
             fig.savefig(outfilename + ".png", bbox_inches='tight')
@@ -194,7 +198,8 @@ def main(folder, intervl):
         axs[1, 1].set_yscale('log')
 
         # plt.show()
-        fig.suptitle("Sentiment of answers to posts by most posting users (95%tile)\nPosts created between " + option_date_from.strftime("%d-%m-%Y") + " to " + option_date_to.strftime("%d-%m-%Y"))
+        fig.suptitle("Sentiment of answers to posts by most posting users (" + str(OLD_USER_PERCENTILE * 100) + "%tile)\nPosts created between " +
+                     option_date_from.strftime("%d-%m-%Y") + " to " + option_date_to.strftime("%d-%m-%Y") + ", n=" + str(len(filteredposts)))
         printnoln("\rcomputing toxic levels: post " + str(len(filteredposts)) + "/" + str(len(filteredposts)) + " ... plotting ... saving ...")
         fig.savefig(goutfilenameoldusers + ".png", bbox_inches='tight')
         plt.close(fig)
diff --git a/calctoxdiff.py b/calctoxdiff.py
index d1c615d..3fa78fd 100644
--- a/calctoxdiff.py
+++ b/calctoxdiff.py
@@ -80,6 +80,7 @@ def plotbypost(onlyfiles, outputdir):
                 f.write(f1 + " -> " + f2 + ": ks neg = " + str(changes_neg[p][i]) + "; ks neu = " + str(changes_neu[p][i])
                         + "; ks pos = " + str(changes_pos[p][i]) + "; ks com = " + str(changes_com[p][i]) + "\n")
     # pval
+    magick = IMAGE_MAGICK
     for (p, l) in files.items():
         x = [l[i].split("_")[3] + " -\n" + l[i + 1].split("_")[3] for i in range(len(l) - 1)]
         fig = plt.figure(figsize=(16, 12))
@@ -93,11 +94,16 @@ def plotbypost(onlyfiles, outputdir):
             plt.plot([xx for (xx, s) in dev], [s for (xx, s) in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with max " + str(p) + " posts")
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: time frame X - time frame X+1")
+        plt.ylabel("p-value")
         plt.legend(loc="upper right")
         plt.savefig(outputdir + "/ks_post_pval_" + str(p) + ".png", bbox_inches='tight')
         plt.close(fig)
+        magick += " " + outputdir + "/ks_post_pval_" + str(p) + ".png"
+    os.system(magick + " " + outputdir + "/ks_post_pval.pdf")
 
     # stat
+    magick = IMAGE_MAGICK
     for (p, l) in files.items():
         x = [l[i].split("_")[3] + " -\n" + l[i + 1].split("_")[3] for i in range(len(l) - 1)]
         fig = plt.figure(figsize=(16, 12))
@@ -111,9 +117,13 @@ def plotbypost(onlyfiles, outputdir):
             plt.plot([xx for (xx, s) in dev], [s for (xx, s) in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with max " + str(p) + " posts")
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: time frame X - time frame X+1")
+        plt.ylabel("stat value")
         plt.legend(loc="upper right")
         plt.savefig(outputdir + "/ks_post_stat_" + str(p) + ".png", bbox_inches='tight')
         plt.close(fig)
+        magick += " " + outputdir + "/ks_post_stat_" + str(p) + ".png"
+    os.system(magick + " " + outputdir + "/ks_post_stat.pdf")
 
 
 def plotbydate(onlyfiles, outputdir):
@@ -122,6 +132,8 @@ def plotbydate(onlyfiles, outputdir):
     for f in onlyfiles:
         s = f[:-3].split("_")
         files[(s[3], s[4])].append(f)
+    dates = sorted(files.keys(), key=lambda e: "-".join(reversed(e[0].split("-"))))
+    files = {d: files[d] for d in dates}
     files = {d: sorted(l, key=lambda e: e.split("_")[5]) for (d, l) in files.items()}
 
     changes_neg = defaultdict(list)
@@ -166,6 +178,7 @@ def plotbydate(onlyfiles, outputdir):
                         + "; ks pos = " + str(changes_pos[d][i]) + "; ks com = " + str(changes_com[d][i]) + "\n")
 
     # pval
+    magick = IMAGE_MAGICK
     for (d, l) in files.items():
         x = [l[i].split("_")[5][:-3] + "-" + l[i + 1].split("_")[5][:-3] for i in range(len(l) - 1)]
         fig = plt.figure(figsize=(16, 12))
@@ -179,11 +192,16 @@ def plotbydate(onlyfiles, outputdir):
             plt.plot([xx for (xx, s) in dev], [s for (xx, s) in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with between " + d[0] + " and " + d[1])
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: X (max) posts - X+1 (max) posts")
+        plt.ylabel("p-value")
         plt.legend(loc="upper right")
         plt.savefig(outputdir + "/ks_date_pval_" + d[0] + "_" + d[1] + ".png", bbox_inches='tight')
         plt.close(fig)
+        magick += " " + outputdir + "/ks_date_pval_" + d[0] + "_" + d[1] + ".png"
+    os.system(magick + " " + outputdir + "/ks_date_pval.pdf")
 
     # stat
+    magick = IMAGE_MAGICK
     for (d, l) in files.items():
         x = [l[i].split("_")[5][:-3] + "-" + l[i + 1].split("_")[5][:-3] for i in range(len(l) - 1)]
         fig = plt.figure(figsize=(16, 12))
@@ -197,9 +215,13 @@ def plotbydate(onlyfiles, outputdir):
             plt.plot([xx for (xx, s) in dev], [s for (xx, s) in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with between " + d[0] + " and " + d[1])
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: X (max) posts - X+1 (max) posts")
+        plt.ylabel("stat value")
         plt.legend(loc="upper right")
         plt.savefig(outputdir + "/ks_date_stat_" + d[0] + "_" + d[1] + ".png", bbox_inches='tight')
         plt.close(fig)
+        magick += " " + outputdir + "/ks_date_stat_" + d[0] + "_" + d[1] + ".png"
+    os.system(magick + " " + outputdir + "/ks_date_stat.pdf")
 
 
 def plotbydateold(onlyfiles, oldfiles, outputdir):
@@ -253,11 +275,6 @@ def plotbydateold(onlyfiles, oldfiles, outputdir):
 
     print("logs")
     for (d, l) in files.items():
-        # print(d)
-        # print("neg is: " + str(len(changes_neg[d])) + " should: " + str(len(l)))
-        # print("neu is: " + str(len(changes_neu[d])) + " should: " + str(len(l)))
-        # print("pos is: " + str(len(changes_pos[d])) + " should: " + str(len(l)))
-        # print("com is: " + str(len(changes_com[d])) + " should: " + str(len(l)))
         f1 = oldfiles[d]
         with open(outputdir + "/ks_olddate_" + d[0] + "_" + d[1] + ".log", "w") as f:
             for i in range(len(l)):
@@ -286,6 +303,8 @@ def plotbydateold(onlyfiles, oldfiles, outputdir):
             plt.plot([dx[0] for dx in dev], [dx[1] for dx in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with new and old users between " + d[0] + " and " + d[1])
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: X (max) posts - X+1 (max) posts")
+        plt.ylabel("p-value")
         plt.legend(loc="upper right")
         outfile = outputdir + "/ks_olddate_pval_" + d[0] + "_" + d[1] + ".png"
         plt.savefig(outfile, bbox_inches='tight')
@@ -312,6 +331,8 @@ def plotbydateold(onlyfiles, oldfiles, outputdir):
             plt.plot([dx[0] for dx in dev], [dx[1] for dx in dev], color=colors[type], ls='None', marker='o')
         plt.title("KS 2-sided test with new and old users between " + d[0] + " and " + d[1])
         plt.xticks(rotation=90)
+        plt.xlabel("Comparision: X (max) posts - X+1 (max) posts")
+        plt.ylabel("stat value")
         plt.legend(loc="upper right")
         outfile = outputdir + "/ks_olddate_stat_" + d[0] + "_" + d[1] + ".png"
         plt.savefig(outfile, bbox_inches='tight')
diff --git a/loader.py b/loader.py
index 74f2b4b..371f225 100644
--- a/loader.py
+++ b/loader.py
@@ -8,6 +8,7 @@ from collections import defaultdict
 from datetime import datetime
 
 from mt import mt
+import gc
 
 TAG_RE = re.compile(r'<[^>]+>')
 
@@ -23,7 +24,9 @@ def cms(): return int(round(time.time() * 1000))
 
 def load(folder):
     users = readUsers(folder + "/Users.xml")
+    gc.collect()
     posts = readPosts(folder + "/Posts.xml")
+    gc.collect()
 
     # get first contribution to page:
     firstcontrib = computefirstcontrib(posts)