diff --git a/contrib/plugins/minimal-up2k.js b/contrib/plugins/minimal-up2k.js
index 0a33e8cd..34473e03 100644
--- a/contrib/plugins/minimal-up2k.js
+++ b/contrib/plugins/minimal-up2k.js
@@ -18,7 +18,7 @@ var u2min = `
 <style>
 
 #ops, #path, #tree, #files, #epi+div+h2,
-#u2conf td.c+.c, #u2cards, #u2foot, #srch_dz, #srch_zd {
+#u2conf td.c+.c, #u2cards, #srch_dz, #srch_zd {
   display: none !important;
 }
 #u2conf {margin:5em auto 0 auto !important}
diff --git a/copyparty/svchub.py b/copyparty/svchub.py
index 774a8ea4..48e1c130 100644
--- a/copyparty/svchub.py
+++ b/copyparty/svchub.py
@@ -358,6 +358,9 @@ class SvcHub(object):
 
             print("nailed it", end="")
             ret = self.retcode
+        except:
+            print("\033[31m[ error during shutdown ]\n{}\033[0m".format(min_ex()))
+            raise
         finally:
             if self.args.wintitle:
                 print("\033]0;\033\\", file=sys.stderr, end="")
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index 82b05a93..0b45895f 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -2515,6 +2515,9 @@ class Up2k(object):
                 except:
                     pass
 
+        if self.args.nw:
+            return
+
         path = os.path.join(histpath, "up2k.snap")
         if not reg:
             if ptop not in self.snap_prev or self.snap_prev[ptop] is not None:
diff --git a/copyparty/web/browser.css b/copyparty/web/browser.css
index 059d4e60..cf4b11d7 100644
--- a/copyparty/web/browser.css
+++ b/copyparty/web/browser.css
@@ -2454,11 +2454,11 @@ html.b #u2conf a.b:hover {
 	color: var(--fg-max);
 	font-style: italic;
 	text-align: center;
-	font-size: .9em;
-	margin: 1em 0;
+	font-size: 1.2em;
+	margin: .8em 0;
 }
 #u2foot .warn {
-	font-size: 1.3em;
+	font-size: 1.2em;
 	padding: .5em .8em;
 	margin: 1em -.6em;
 	border-width: .1em 0;
@@ -2472,6 +2472,9 @@ html.b #u2conf a.b:hover {
 	font-size: .9em;
 	font-weight: normal;
 }
+#u2foot>*+* {
+	margin-top: 1.5em;
+}
 .prog {
 	font-family: 'scp', monospace, monospace;
 }
diff --git a/copyparty/web/browser.js b/copyparty/web/browser.js
index 4eddd58d..d79e0b98 100644
--- a/copyparty/web/browser.js
+++ b/copyparty/web/browser.js
@@ -288,6 +288,9 @@ var Ls = {
 		"u_https2": "switch to https",
 		"u_https3": "for much better performance",
 		"u_ancient": 'your browser is impressively ancient -- maybe you should <a href="#" onclick="goto(\'bup\')">use bup instead</a>',
+		"u_enpot": 'switch to <a href="#">potato UI</a> (may improve upload speed)',
+		"u_depot": 'switch to <a href="#">fancy UI</a> (may reduce upload speed)',
+		"u_gotpot": 'switching to the potato UI for improved upload speed,\n\nfeel free to disagree and switch back!',
 		"u_ever": "this is the basic uploader; up2k needs at least<br>chrome 21 // firefox 13 // edge 12 // opera 12 // safari 5.1",
 		"u_su2k": 'this is the basic uploader; <a href="#" id="u2yea">up2k</a> is better',
 		"u_ewrite": 'you do not have write-access to this folder',
@@ -616,6 +619,9 @@ var Ls = {
 		"u_https2": "bytte til https",
 		"u_https3": "for mye høyere hastighet",
 		"u_ancient": 'nettleseren din er prehistorisk -- mulig du burde <a href="#" onclick="goto(\'bup\')">bruke bup istedenfor</a>',
+		"u_enpot": 'bytt til <a href="#">enkelt UI</a> (gir sannsynlig raskere opplastning)',
+		"u_depot": 'bytt til <a href="#">snæsent UI</a> (gir sannsynlig tregere opplastning)',
+		"u_gotpot": 'byttet til et enklere UI for å laste opp raskere,\n\ndu kan gjerne bytte tilbake altså!',
 		"u_ever": "dette er den primitive opplasteren; up2k krever minst:<br>chrome 21 // firefox 13 // edge 12 // opera 12 // safari 5.1",
 		"u_su2k": 'dette er den primitive opplasteren; <a href="#" id="u2yea">up2k</a> er bedre',
 		"u_ewrite": 'du har ikke skrivetilgang i denne mappen',
@@ -785,7 +791,7 @@ ebi('op_up2k').innerHTML = (
 	'</table><div id="u2mu"></div></div>\n' +
 
 	'<p id="u2flagblock"><b>' + L.ul_flagblk + '</p>\n' +
-	'<p id="u2foot"></p>'
+	'<div id="u2foot"></div>'
 );
 
 
diff --git a/copyparty/web/up2k.js b/copyparty/web/up2k.js
index eea316c1..ad03df1d 100644
--- a/copyparty/web/up2k.js
+++ b/copyparty/web/up2k.js
@@ -136,7 +136,7 @@ function up2k_flagbus() {
 }
 
 
-function U2pvis(act, btns, uc) {
+function U2pvis(act, btns, uc, st) {
     var r = this;
     r.act = act;
     r.ctr = { "ok": 0, "ng": 0, "bz": 0, "q": 0 };
@@ -145,6 +145,8 @@ function U2pvis(act, btns, uc) {
     r.tail = -1;
     r.wsz = 3;
     r.npotato = 99;
+    r.modn = 0;
+    r.modv = 0;
 
     var markup = {
         '404': '<span class="err">404</span>',
@@ -347,7 +349,10 @@ function U2pvis(act, btns, uc) {
     };
 
     r.bzw = function () {
-        var first = QS('#u2tab>tbody>tr:first-child');
+        var mod = 0,
+            t0 = Date.now(),
+            first = QS('#u2tab>tbody>tr:first-child');
+
         if (!first)
             return;
 
@@ -357,17 +362,67 @@ function U2pvis(act, btns, uc) {
 
         while (r.head - first > r.wsz) {
             qsr('#f' + (first++));
+            mod++;
         }
-        while (last - r.tail < r.wsz && last < r.tab.length - 2) {
+        while (last - r.tail < r.wsz && last < r.tab.length - 1) {
             var obj = ebi('f' + (++last));
-            if (!obj)
+            if (!obj) {
                 r.addrow(last);
+                mod++;
+            }
+        }
+        if (mod && r.modn < 200 && ebi('repl').offsetTop) {
+            if (++r.modn >= 10)
+                r.modv += Date.now() - t0;
+
+            if (r.modn >= 200) {
+                var d = r.modv / (r.modn - 10);
+                console.log('bzw:', d, ', tab:' + r.tab.length);
+
+                if (d >= 1.5 && r.tab.length >= 1000 && st.bytes.total / r.tab.length < 1024 * 1024 * 4)
+                    r.go_potato();
+            }
         }
     };
 
+    r.potatolabels = function () {
+        var ode = ebi('u2depotato'),
+            oen = ebi('u2enpotato');
+
+        if (!ode)
+            return;
+
+        ode.style.display = uc.potato ? '' : 'none';
+        oen.style.display = uc.potato ? 'none' : '';
+    }
+
     r.potato = function () {
+        ebi('u2tabw').style.minHeight = '';
         QS('#u2cards a[act="bz"]').click();
         timer[uc.potato ? "add" : "rm"](draw_potato);
+        r.potatolabels();
+    };
+
+    r.go_potato = function () {
+        r.go_potato = noop;
+        var ode = mknod('div', 'u2depotato'),
+            oen = mknod('div', 'u2enpotato'),
+            u2f = ebi('u2foot'),
+            btn = ebi('potato');
+
+        ode.innerHTML = L.u_depot;
+        oen.innerHTML = L.u_enpot;
+
+        if (sread('potato') === null) {
+            btn.click();
+            toast.inf(30, L.u_gotpot);
+            localStorage.removeItem('potato');
+        }
+
+        u2f.appendChild(ode);
+        u2f.appendChild(oen);
+        ode.onclick = oen.onclick = btn.onclick;
+        r.potatolabels();
     };
 
     function draw_potato() {
@@ -582,7 +637,7 @@ function Donut(uc, st) {
             v = pos() - r.base,
             ofs = o - o * v / t;
 
-        if (!uc.potato || ++r.dc >= 2) {
+        if (!uc.potato || ++r.dc >= 4) {
             el.style.strokeDashoffset = ofs;
             r.dc = 0;
         }
@@ -661,7 +716,10 @@ function up2k_init(subtle) {
                 m = L.u_ancient;
                 setmsg('');
             }
-            ebi('u2foot').innerHTML = '<big>' + m + '</big>';
+            qsr('#u2depmsg');
+            var o = mknod('div', 'u2depmsg');
+            o.innerHTML = m;
+            ebi('u2foot').appendChild(o);
         }
         loading_deps = true;
     }
@@ -737,7 +795,9 @@ function up2k_init(subtle) {
             "hashing": 0,
             "uploading": 0,
             "busy": 0
-        }
+        },
+        "modv": 0,
+        "modn": 0
     };
 
     function push_t(arr, t) {
@@ -749,7 +809,7 @@ function up2k_init(subtle) {
             });
     }
 
-    var pvis = new U2pvis("bz", '#u2cards', uc),
+    var pvis = new U2pvis("bz", '#u2cards', uc, st),
         donut = new Donut(uc, st);
 
     r.ui = pvis;
@@ -1148,7 +1208,7 @@ function up2k_init(subtle) {
     }
     more_one_file();
 
-    var etaref = 0, etaskip = 0, utw_minh = 0;
+    var etaref = 0, etaskip = 0, utw_minh = 0, utw_read = 0;
     function etafun() {
         var nhash = st.busy.head.length + st.busy.hash.length + st.todo.head.length + st.todo.hash.length,
             nsend = st.busy.upload.length + st.todo.upload.length,
@@ -1161,6 +1221,11 @@ function up2k_init(subtle) {
 
         //ebi('acc_info').innerHTML = humantime(st.time.busy) + ' ' + f2f(now / 1000, 1);
 
+        if (++utw_read >= 20) {
+            utw_read = 0;
+            utw_minh = parseInt(ebi('u2tabw').style.minHeight || '0');
+        }
+
         var minh = QS('#op_up2k.act') && st.is_busy ? Math.max(utw_minh, ebi('u2tab').offsetHeight + 32) : 0;
         if (utw_minh < minh || !utw_minh) {
             utw_minh = minh;
@@ -1425,6 +1490,20 @@ function up2k_init(subtle) {
                     mou_ikkai = true;
                 }
 
+                if (is_busy && st.modn < 100) {
+                    var t0 = Date.now() + (ebi('repl').offsetTop ? 0 : 0);
+
+                    if (++st.modn >= 10)
+                        st.modv += Date.now() - t0;
+
+                    if (st.modn >= 100) {
+                        var d = st.modv / (st.modn - 10);
+                        console.log('tsk:', d);
+                        if (d >= 1.2)
+                            pvis.go_potato();
+                    }
+                }
+
                 if (!mou_ikkai || crashed)
                     return defer();
             }
@@ -2103,21 +2182,19 @@ function up2k_init(subtle) {
     }
 
     function draw_turbo() {
-        var msg = uc.fsearch ? L.u_ts : L.u_tu,
-            omsg = uc.fsearch ? L.u_tu : L.u_ts,
-            html = ebi('u2foot').innerHTML,
-            ohtml = html;
+        var msg = (turbolvl || !uc.turbo) ? null : uc.fsearch ? L.u_ts : L.u_tu,
+            html = ebi('u2foot').innerHTML;
 
-        if (turbolvl || !uc.turbo)
-            msg = null;
+        if (msg && html.indexOf(msg) + 1)
+            return;
 
-        if (msg && html.indexOf(msg) === -1)
-            html = html.replace(omsg, '') + msg;
-        else if (!msg)
-            html = html.replace(L.u_tu, '').replace(L.u_ts, '');
+        qsr('#u2turbomsg');
+        if (!msg)
+            return;
 
-        if (html !== ohtml)
-            ebi('u2foot').innerHTML = html;
+        var o = mknod('div', 'u2turbomsg');
+        o.innerHTML = msg;
+        ebi('u2foot').appendChild(o);
     }
     draw_turbo();
 
diff --git a/docs/notes.sh b/docs/notes.sh
index bbe98a96..7fad74f5 100644
--- a/docs/notes.sh
+++ b/docs/notes.sh
@@ -48,10 +48,10 @@ avg() { awk 'function pr(ncsz) {if (nsmp>0) {printf "%3s %s\n", csz, sum/nsmp} c
 ## time between first and last upload
 
 python3 -um copyparty -nw -v srv::rw -i 127.0.0.1 2>&1 | tee log 
-cat log | awk '!/"purl"/{next} {s=$1;sub(/[^m]+m/,"");gsub(/:/," ");t=60*(60*$1+$2)+$3} !a{a=t;sa=s} {b=t;sb=s} END {print b-a,sa,sb}'
+cat log | awk '!/"purl"/{next} {s=$1;sub(/[^m]+m/,"");gsub(/:/," ");t=60*(60*$1+$2)+$3} t<p{t+=86400} !a{a=t;sa=s} {b=t;sb=s} END {print b-a,sa,sb}'
 
 # or if the client youre measuring dies for ~15sec every once ina while and you wanna filter those out,
-cat log | awk '!/"purl"/{next} {s=$1;sub(/[^m]+m/,"");gsub(/:/," ");t=60*(60*$1+$2)+$3} !p{a=t;p=t;r=0;next} t-p>1{printf "%.3f += %.3f - %.3f  (%.3f)  # %.3f -> %.3f\n",r,p,a,p-a,p,t;r+=p-a;a=t} {p=t} END {print r+p-a}'
+cat log | awk '!/"purl"/{next} {s=$1;sub(/[^m]+m/,"");gsub(/:/," ");t=60*(60*$1+$2)+$3} t<p{t+=86400} !p{a=t;p=t;r=0;next} t-p>1{printf "%.3f += %.3f - %.3f  (%.3f)  # %.3f -> %.3f\n",r,p,a,p-a,p,t;r+=p-a;a=t} {p=t} END {print r+p-a}'
 
 
 ##