diff --git a/loadtest/tinode.beam b/loadtest/tinode.beam
index 3c57efbb..abb78eb8 100644
Binary files a/loadtest/tinode.beam and b/loadtest/tinode.beam differ
diff --git a/loadtest/tinode.erl b/loadtest/tinode.erl
index 91aedc81..52f8d535 100644
--- a/loadtest/tinode.erl
+++ b/loadtest/tinode.erl
@@ -5,7 +5,7 @@
 %% directory.
 
 -module(tinode).
--export([rand_user_secret/1, shuffle/1]).
+-export([rand_user_secret/1, shuffle/1, cache_token/2, read_token/1]).
 
 %% Produces a secret for use in basic login.
 rand_user_secret({Pid, DynData}) ->
@@ -27,3 +27,19 @@ get_rand_secret() ->
 shuffle(L) ->
   RandomList=[{rand:uniform(), X} || X <- L],
   [X || {_,X} <- lists:sort(RandomList)].
+
+%% Reads previously cached token for the specified user.
+read_token(Uid) ->
+  {ok, LogDir} = application:get_env(tsung_controller, log_dir_real),
+  case file:read_file(filename:join(LogDir, Uid)) of
+    {ok, Data} -> string:trim(Data);
+    {error, _} -> ""
+  end.
+
+%% Saves auth token for the specified user in the log directory.
+cache_token(Uid, Token) ->
+  {ok, LogDir} = application:get_env(tsung_controller, log_dir_real),
+  {ok, File} = file:open(filename:join(LogDir, Uid), [write]),
+  file:write(File, Token),
+  file:close(File),
+  ok.
diff --git a/loadtest/tsung.xml b/loadtest/tsung.xml
index fb3d23f7..8a163d5f 100644
--- a/loadtest/tsung.xml
+++ b/loadtest/tsung.xml
@@ -11,7 +11,7 @@
 
   <load>
     <arrivalphase phase="1" duration="120" unit="second">
-      <users maxnumber="100" arrivalrate="1" unit="second" />
+      <users maxnumber="1500" arrivalrate="10" unit="second" />
     </arrivalphase>
   </load>
 
@@ -31,9 +31,49 @@
         <websocket type="message">{"hi":{"id":"%%_baseid%%01","ver":"0.15","ua":"Tsung-Loadtest/1.0; tsung/1.7.0"}}</websocket>
       </request>
 
-      <request subst="true">
-        <websocket type="message">{"login":{"id":"%%_baseid%%02","scheme":"basic","secret":"%%tinode:rand_user_secret%%"}}</websocket>
-      </request>
+      <!-- Randomly pick a user. -->
+      <setdynvars sourcetype="eval"
+        code='fun({Pid, DynVars}) ->
+                    tinode:rand_user_secret({Pid, DynVars})
+                  end.'>
+        <var name="secret" />
+      </setdynvars>
+
+      <!-- Read auth token from the cache. -->
+      <setdynvars sourcetype="eval"
+        code='fun({Pid, DynVars}) ->
+                    {ok, Secret} = ts_dynvars:lookup(secret, DynVars),
+                    tinode:read_token(Secret)
+                  end.'>
+        <var name="token" />
+      </setdynvars>
+
+      <!-- Token present. Authenticate with it. -->
+      <if var="token" neq="">
+        <request subst="true">
+          <match do="abort" when="nomatch">{"ctrl":.*"code":200.*}</match>
+          <websocket type="message">{"login":{"id":"%%_baseid%%02","scheme":"token","secret":"%%_token%%"}}</websocket>
+        </request>
+      </if>
+
+      <!-- else log in with user name and password. -->
+      <if var="token" eq="">
+        <request subst="true">
+          <match do="abort" when="nomatch">{"ctrl":.*"code":200.*}</match>
+          <dyn_variable name="token" re='^{"ctrl":.*"token":"([-A-Za-z0-9+\/=]+={0,3})".*}$'/>
+          <websocket type="message">{"login":{"id":"%%_baseid%%02","scheme":"basic","secret":"%%_secret%%"}}</websocket>
+        </request>
+
+        <!-- Save token in the cache. -->
+        <setdynvars sourcetype="eval"
+          code='fun({_, DynVars}) ->
+                      {ok, Token} = ts_dynvars:lookup(token, DynVars),
+                      {ok, Secret} = ts_dynvars:lookup(secret, DynVars),
+                      tinode:cache_token(Secret, Token)
+                    end.'>
+          <var name="dummy" />
+        </setdynvars>
+      </if>
 
       <request subst="true">
         <websocket type="message" frame="text">{"sub":{"id":"%%_baseid%%03","topic":"me","get":{"what":"desc"}}}</websocket>