diff --git a/common/log.cc b/common/log.cc
index 77aaa004..f576071e 100644
--- a/common/log.cc
+++ b/common/log.cc
@@ -133,7 +133,12 @@ void percent(uint64_t count, uint64_t max, bool displayElapsed)
 
 percent_clock::~percent_clock()
 {
+    if (count != max - 1) {
+        print("ERROR TO FIX LATER: clock counter ended too early\n");
+    }
+
+    count = max - 1;
     increase();
-    Q_assert(count == max);
+    //Q_assert(count == max);
 }
 }; // namespace logging
diff --git a/include/qbsp/portals.hh b/include/qbsp/portals.hh
index 6012c0aa..a755bafd 100644
--- a/include/qbsp/portals.hh
+++ b/include/qbsp/portals.hh
@@ -72,7 +72,7 @@ twosided<std::list<std::unique_ptr<buildportal_t>>> SplitNodePortals(const node_
 enum class portaltype_t {
     TREE, VIS
 };
-std::list<std::unique_ptr<buildportal_t>> MakeTreePortals_r(tree_t *tree, node_t *node, portaltype_t type, std::list<std::unique_ptr<buildportal_t>> boundary_portals, portalstats_t &stats);
+std::list<std::unique_ptr<buildportal_t>> MakeTreePortals_r(tree_t *tree, node_t *node, portaltype_t type, std::list<std::unique_ptr<buildportal_t>> boundary_portals, portalstats_t &stats, logging::percent_clock &clock);
 void MakeTreePortals(tree_t *tree);
 std::list<std::unique_ptr<buildportal_t>> MakeHeadnodePortals(tree_t *tree);
 void MakePortalsFromBuildportals(tree_t *tree, std::list<std::unique_ptr<buildportal_t>> buildportals);
diff --git a/qbsp/portals.cc b/qbsp/portals.cc
index 74b5a3f6..060a06b8 100644
--- a/qbsp/portals.cc
+++ b/qbsp/portals.cc
@@ -465,8 +465,10 @@ MakeTreePortals_r
 Given the list of portals bounding `node`, returns the portal list for a fully-portalized `node`.
 ==================
 */
-std::list<std::unique_ptr<buildportal_t>> MakeTreePortals_r(tree_t *tree, node_t *node, portaltype_t type, std::list<std::unique_ptr<buildportal_t>> boundary_portals, portalstats_t &stats)
+std::list<std::unique_ptr<buildportal_t>> MakeTreePortals_r(tree_t *tree, node_t *node, portaltype_t type, std::list<std::unique_ptr<buildportal_t>> boundary_portals, portalstats_t &stats, logging::percent_clock &clock)
 {
+    clock.increase();
+
     if (node->is_leaf || (type == portaltype_t::VIS && node->detail_separator)) {
         return boundary_portals;
     }
@@ -482,8 +484,8 @@ std::list<std::unique_ptr<buildportal_t>> MakeTreePortals_r(tree_t *tree, node_t
     std::list<std::unique_ptr<buildportal_t>> result_portals_front, result_portals_back;
 
     tbb::task_group g;
-    g.run([&]() { result_portals_front = MakeTreePortals_r(tree, node->children[0], type, std::move(boundary_portals_split.front), stats); });
-    g.run([&]() { result_portals_back = MakeTreePortals_r(tree, node->children[1], type, std::move(boundary_portals_split.back), stats); });
+    g.run([&]() { result_portals_front = MakeTreePortals_r(tree, node->children[0], type, std::move(boundary_portals_split.front), stats, clock); });
+    g.run([&]() { result_portals_back = MakeTreePortals_r(tree, node->children[1], type, std::move(boundary_portals_split.back), stats, clock); });
     g.wait();
 
     // sequential part: push the nodeportal down each side of the bsp so it connects leafs
@@ -525,9 +527,14 @@ void MakeTreePortals(tree_t *tree)
 
     auto headnodeportals = MakeHeadnodePortals(tree);
 
-    auto buildportals = MakeTreePortals_r(tree, tree->headnode, portaltype_t::TREE, std::move(headnodeportals), stats);
+    {
+        logging::percent_clock clock;
+        clock.max = tree->nodes.size() + 1;
 
-    MakePortalsFromBuildportals(tree, std::move(buildportals));
+        auto buildportals = MakeTreePortals_r(tree, tree->headnode, portaltype_t::TREE, std::move(headnodeportals), stats, clock);
+
+        MakePortalsFromBuildportals(tree, std::move(buildportals));
+    }
 
     logging::header("CalcTreeBounds");
 
diff --git a/qbsp/prtfile.cc b/qbsp/prtfile.cc
index 329663d0..b34a95d9 100644
--- a/qbsp/prtfile.cc
+++ b/qbsp/prtfile.cc
@@ -266,11 +266,17 @@ void WritePortalFile(tree_t *tree)
     MakeHeadnodePortals(tree);
 
     portalstats_t stats{};
+    
+    {
+        // FIXME: iteration count isn't tree->nodes.size() here
+        logging::percent_clock clock;
+        clock.max = tree->nodes.size() + 1;
 
-    // vis portal generation doesn't use headnode portals
-    auto buildportals = MakeTreePortals_r(tree, tree->headnode, portaltype_t::VIS, {}, stats);
+        // vis portal generation doesn't use headnode portals
+        auto buildportals = MakeTreePortals_r(tree, tree->headnode, portaltype_t::VIS, {}, stats, clock);
 
-    MakePortalsFromBuildportals(tree, std::move(buildportals));
+        MakePortalsFromBuildportals(tree, std::move(buildportals));
+    }
 
     /* save portal file for vis tracing */
     WritePortalfile(tree->headnode, &state);
diff --git a/qbsp/tree.cc b/qbsp/tree.cc
index 1b02e3cc..2db2aba5 100644
--- a/qbsp/tree.cc
+++ b/qbsp/tree.cc
@@ -100,6 +100,7 @@ static void ConvertNodeToLeaf(node_t *node, const contentflags_t &contents)
     node->is_leaf = true;
 
     for (auto &child : node->children) {
+        *child = {}; // clear everything in the node
         child = nullptr;
     }