diff --git a/src/ast/rewriter/pb_rewriter_def.h b/src/ast/rewriter/pb_rewriter_def.h
index 13440604d..4c93a8b76 100644
--- a/src/ast/rewriter/pb_rewriter_def.h
+++ b/src/ast/rewriter/pb_rewriter_def.h
@@ -258,9 +258,7 @@ lbool pb_rewriter_util<PBU>::normalize(typename PBU::args_t& args, typename PBU:
         typename PBU::numeral n0 = k/max;
         typename PBU::numeral n1 = floor(n0);
         typename PBU::numeral n2 = ceil(k/min) - PBU::numeral::one();
-        if (n1 == n2 && !n0.is_int()) {
-            IF_VERBOSE(3, display(verbose_stream() << "set cardinality\n", args, k, is_eq););
-            
+        if (n1 == n2 && !n0.is_int()) {            
             for (unsigned i = 0; i < args.size(); ++i) {
                 args[i].second = PBU::numeral::one();
             }
diff --git a/src/sat/sat_types.h b/src/sat/sat_types.h
index 7ebbf5339..94ca8a85f 100644
--- a/src/sat/sat_types.h
+++ b/src/sat/sat_types.h
@@ -26,7 +26,6 @@ Revision History:
 #include "util/vector.h"
 #include "util/uint_set.h"
 #include "util/stopwatch.h"
-#include<iomanip>
 
 class params_ref;
 class reslimit;
@@ -207,14 +206,6 @@ namespace sat {
         }
     };
 
-    struct mem_stat {
-    };
-
-    inline std::ostream & operator<<(std::ostream & out, mem_stat const & m) {
-        double mem = static_cast<double>(memory::get_allocation_size())/static_cast<double>(1024*1024);
-        return out << std::fixed << std::setprecision(2) << mem;
-    }
-
     struct dimacs_lit {
         literal m_lit;
         dimacs_lit(literal l):m_lit(l) {}
diff --git a/src/smt/smt_context.cpp b/src/smt/smt_context.cpp
index c257ff141..dca77ed29 100644
--- a/src/smt/smt_context.cpp
+++ b/src/smt/smt_context.cpp
@@ -2648,7 +2648,6 @@ namespace smt {
         }
 
         TRACE("simplify_clauses_detail", tout << "before:\n"; display_clauses(tout, m_lemmas););
-        IF_VERBOSE(2, verbose_stream() << "(smt.simplifying-clause-set"; verbose_stream().flush(););
 
         SASSERT(check_clauses(m_lemmas));
         SASSERT(check_clauses(m_aux_clauses));
@@ -2681,12 +2680,88 @@ namespace smt {
             num_del_clauses += simplify_clauses(m_aux_clauses, s.m_aux_clauses_lim);
             num_del_clauses += simplify_clauses(m_lemmas, bs.m_lemmas_lim);
         }
+        m_stats.m_num_del_clauses += num_del_clauses;
+        m_stats.m_num_simplifications++;
         TRACE("simp_counter", tout << "simp_counter: " << m_simp_counter << " scope_lvl: " << m_scope_lvl << "\n";);
-        IF_VERBOSE(2, verbose_stream() << " :num-deleted-clauses " << num_del_clauses << ")" << std::endl;);
         TRACE("simplify_clauses_detail", tout << "after:\n"; display_clauses(tout, m_lemmas););
         SASSERT(check_clauses(m_lemmas) && check_clauses(m_aux_clauses));
     }
 
+    void context::log_stats() {
+        size_t bin_lemmas = 0;
+        for (watch_list const& w : m_watches) {
+            bin_lemmas += w.end_literals() - w.begin_literals();
+        }
+        bin_lemmas /= 2;
+        std::stringstream strm;
+        strm << "(smt.stats " 
+             << std::setw(4) << m_stats.m_num_restarts << " "
+             << std::setw(6) << m_stats.m_num_conflicts << " "
+             << std::setw(6) << m_stats.m_num_decisions << " " 
+             << std::setw(6) << m_stats.m_num_propagations << " "
+             << std::setw(5) << m_aux_clauses.size() << "/" << bin_lemmas << " "
+             << std::setw(5) << m_lemmas.size() << " "
+             << std::setw(5) << m_stats.m_num_simplifications << " "
+             << std::setw(4) << m_stats.m_num_del_clauses << " "
+             << std::setw(7) << mem_stat() << ")\n";
+
+        std::string str(strm.str());
+        svector<size_t> offsets;
+        for (size_t i = 0; i < str.size(); ++i) {
+            while (i < str.size() && str[i] != ' ') ++i;
+            while (i < str.size() && str[i] == ' ') ++i;
+            // position of first character after space
+            if (i < str.size()) {
+                offsets.push_back(i);
+            }
+        }   
+        bool same = m_last_positions.size() == offsets.size();
+        size_t diff = 0;
+        for (unsigned i = 0; i < offsets.size() && same; ++i) {
+            if (m_last_positions[i] > offsets[i]) diff += m_last_positions[i] - offsets[i];
+            if (m_last_positions[i] < offsets[i]) diff += offsets[i] - m_last_positions[i];
+        }
+
+        if (m_last_positions.empty() || 
+            m_stats.m_num_restarts >= 20 + m_last_position_log ||
+            (m_stats.m_num_restarts >= 6 + m_last_position_log && (!same || diff > 3))) {
+            m_last_position_log = m_stats.m_num_restarts;
+            // restarts       decisions      clauses    simplifications  memory
+            //      conflicts       propagations    lemmas       deletions
+            int adjust[9] = { -3, -3, -3, -3, -3, -3, -4, -4, -1 };
+            char const* tag[9] = { ":restarts ", ":conflicts ", ":decisions ", ":propagations ", ":clauses/bin ", ":lemmas ", ":simplify ", ":deletions", ":memory" };
+
+            std::stringstream l1, l2;
+            l1 << "(sat.stats ";
+            l2 << "(sat.stats ";
+            size_t p1 = 11, p2 = 11;
+            SASSERT(offsets.size() == 9);
+            for (unsigned i = 0; i < offsets.size(); ++i) {
+                size_t p = offsets[i];
+                if (i & 0x1) {
+                    // odd positions
+                    for (; p2 < p + adjust[i]; ++p2) l2 << " ";
+                    p2 += strlen(tag[i]);
+                    l2 << tag[i];
+                }
+                else {
+                    // even positions
+                    for (; p1 < p + adjust[i]; ++p1) l1 << " ";
+                    p1 += strlen(tag[i]);
+                    l1 << tag[i];
+                }                               
+            }
+            for (; p1 + 2 < str.size(); ++p1) l1 << " ";            
+            for (; p2 + 2 < str.size(); ++p2) l2 << " ";            
+            l1 << ")\n";
+            l2 << ")\n";
+            IF_VERBOSE(1, verbose_stream() << l1.str() << l2.str());
+            m_last_positions.reset();
+            m_last_positions.append(offsets);
+        }
+        IF_VERBOSE(1, verbose_stream() << str);
+    }
+
     struct clause_lt {
         bool operator()(clause * cls1, clause * cls2) const { return cls1->get_activity() > cls2->get_activity(); }
     };
@@ -3722,16 +3797,7 @@ namespace smt {
         inc_limits();
         if (status == l_true || !m_fparams.m_restart_adaptive || m_agility < m_fparams.m_restart_agility_threshold) {
             SASSERT(!inconsistent());
-            IF_VERBOSE(2, verbose_stream() << "(smt.restarting :propagations " << m_stats.m_num_propagations
-                       << " :decisions " << m_stats.m_num_decisions
-                       << " :conflicts " << m_stats.m_num_conflicts << " :restart " << m_restart_threshold;
-                       if (m_fparams.m_restart_strategy == RS_IN_OUT_GEOMETRIC) {
-                           verbose_stream() << " :restart-outer " << m_restart_outer_threshold;
-                       }
-                       if (m_fparams.m_restart_adaptive) {
-                           verbose_stream() << " :agility " << m_agility;
-                       }
-                       verbose_stream() << ")\n");
+            log_stats();
             // execute the restart
             m_stats.m_num_restarts++;
             m_num_restarts++;
diff --git a/src/smt/smt_context.h b/src/smt/smt_context.h
index 6addf1479..ebef0e807 100644
--- a/src/smt/smt_context.h
+++ b/src/smt/smt_context.h
@@ -232,6 +232,9 @@ namespace smt {
         literal2assumption         m_literal2assumption; // maps an expression associated with a literal to the original assumption
         expr_ref_vector            m_unsat_core;
 
+        unsigned                   m_last_position_log { 0 };
+        svector<size_t>            m_last_positions;
+
         // -----------------------------------
         //
         // Theory case split
@@ -1568,6 +1571,8 @@ namespace smt {
 
         void display_partial_assignment(std::ostream& out, expr_ref_vector const& asms, unsigned min_core_size);
 
+        void log_stats();
+
     public:
         context(ast_manager & m, smt_params & fp, params_ref const & p = params_ref());
 
diff --git a/src/smt/smt_statistics.h b/src/smt/smt_statistics.h
index 587c35c63..45022b31c 100644
--- a/src/smt/smt_statistics.h
+++ b/src/smt/smt_statistics.h
@@ -45,6 +45,8 @@ namespace smt {
         unsigned m_max_generation;
         unsigned m_num_minimized_lits;
         unsigned m_num_checks;
+        unsigned m_num_simplifications;
+        unsigned m_num_del_clauses;
         statistics() {
             reset();
         }
diff --git a/src/util/memory_manager.h b/src/util/memory_manager.h
index 2faa4da7d..3e7626e29 100644
--- a/src/util/memory_manager.h
+++ b/src/util/memory_manager.h
@@ -20,6 +20,7 @@ Revision History:
 
 #include<cstdlib>
 #include<ostream>
+#include<iomanip>
 #include "util/z3_exception.h"
 
 #ifndef __has_builtin
@@ -127,5 +128,13 @@ void dealloc_svect(T * ptr) {
     memory::deallocate(ptr);
 }
 
+struct mem_stat {
+};
+
+inline std::ostream & operator<<(std::ostream & out, mem_stat const & m) {
+    double mem = static_cast<double>(memory::get_allocation_size())/static_cast<double>(1024*1024);
+    return out << std::fixed << std::setprecision(2) << mem;
+}
+