diff --git a/plugins/timelib/timelib.cpp b/plugins/timelib/timelib.cpp
index f59061b1485..75d3c4568e8 100644
--- a/plugins/timelib/timelib.cpp
+++ b/plugins/timelib/timelib.cpp
@@ -796,7 +796,6 @@ TIMELIB_API unsigned int TIMELIB_CALL tlAdjustCalendar(unsigned int date, short
     unsigned int    month = (date - (year * 10000)) / 100;
     unsigned int    day = date - (year * 10000) - (month * 100);
     int             expectedMonthVal = month - 1;
-    time_t          seconds [[maybe_unused]];
     unsigned int    result = 0;
 
     // Normalize the expected month value
@@ -823,7 +822,7 @@ TIMELIB_API unsigned int TIMELIB_CALL tlAdjustCalendar(unsigned int date, short
     timeInfo.tm_mon += month_delta;
     timeInfo.tm_isdst = -1;
 
-    seconds = tlMKTime(&timeInfo);
+    tlMKTime(&timeInfo);
 
     if (timeInfo.tm_mon != expectedMonthVal)
     {
diff --git a/roxie/roxiemem/roxiemem.cpp b/roxie/roxiemem/roxiemem.cpp
index c8024b61424..ffddbfbd673 100644
--- a/roxie/roxiemem/roxiemem.cpp
+++ b/roxie/roxiemem/roxiemem.cpp
@@ -8425,6 +8425,7 @@ class RoxieMemTests : public CppUnit::TestFixture
 
         for (unsigned pass=0; pass < 8; pass++)
         {
+            //numPagesAfterCleanup() also has the side-effect of freeing up any empty pages.
             [[maybe_unused]] unsigned numPagesFull = rowManager->numPagesAfterCleanup(true);
             unsigned numRowsLeft = 0;
             unsigned target=0;
diff --git a/system/jhtree/jhinplace.cpp b/system/jhtree/jhinplace.cpp
index 620cef8e2b8..dad79e27239 100644
--- a/system/jhtree/jhinplace.cpp
+++ b/system/jhtree/jhinplace.cpp
@@ -267,83 +267,6 @@ inline void skipPacked(const byte * & cur)
     } while (next >= 0x80);
 }
 
-//----- special packed format - code is untested
-
-#ifdef ALTERNATIVE_PACKING_FORMAT
-inline unsigned getLeadingMask(byte extraBytes) { return (0x100U - (1U << (8-extraBytes))); }
-inline unsigned getLeadingValueMask(byte extraBytes) { return (~getLeadingMask(extraBytes)) >> 1; }
-
-static void serializePacked2(MemoryBuffer & out, size32_t value)
-{
-    //Efficiency of serialization is not the key consideration
-    byte mask = 0;
-    unsigned size = sizePacked(value);
-    constexpr unsigned maxBytes = 9;
-    byte result[maxBytes];
-
-    for (unsigned i=1; i < size; i++)
-    {
-        result[maxBytes - i] = value;
-        value >>= 8;
-        mask = 0x80 | (mask >> 1);
-    }
-    unsigned start = maxBytes - size;
-    result[start] |= mask;
-    out.append(size, result + start);
-}
-
-inline unsigned numExtraBytesFromFirst1(byte first)
-{
-    if (first >= 0xF0)
-        if (first >= 0xFC)
-            if (first >= 0xFE)
-                if (first >= 0xFF)
-                    return 8;
-                else
-                    return 7;
-            else
-                return 6;
-        else
-            if (first >= 0xF8)
-                return 5;
-            else
-                return 4;
-    else
-        if (first >= 0xC0)
-            if (first >= 0xE0)
-                return 3;
-            else
-                return 2;
-        else
-            return (first >> 7);    // (first >= 0x80) ? 1 : 0
-}
-
-inline unsigned numExtraBytesFromFirst2(byte first)
-{
-    //Surely should be faster, but seems slower on AMD. Retest in its actual context
-    unsigned value = first;
-    return countLeadingUnsetBits(~(value << 24));
-}
-
-inline unsigned numExtraBytesFromFirst(byte first)
-{
-    return numExtraBytesFromFirst1(first);
-}
-
-inline unsigned readPacked2(const byte * & cur)
-{
-    byte first = *cur++;
-    unsigned extraBytes = numExtraBytesFromFirst(first);
-    unsigned value = first & getLeadingValueMask(extraBytes);
-    while (extraBytes--)
-    {
-        value <<= 8;
-        value |= *cur++;
-    }
-    return value;
-}
-#endif
-
 //-------------------
 
 static unsigned bytesRequired(unsigned __int64 value)
@@ -2694,32 +2617,9 @@ static int normalizeCompare(int x)
 class InplaceIndexTest : public CppUnit::TestFixture
 {
     CPPUNIT_TEST_SUITE( InplaceIndexTest  );
-        //CPPUNIT_TEST(testBytesFromFirstTiming);
         CPPUNIT_TEST(testSearching);
     CPPUNIT_TEST_SUITE_END();
 
-#ifdef ALTERNATIVE_PACKING_FORMAT
-    void testBytesFromFirstTiming()
-    {
-        for (unsigned i=0; i <= 0xff; i++)
-            assertex(numExtraBytesFromFirst1(i) == numExtraBytesFromFirst2(i));
-        unsigned total = 0;
-        {
-            CCycleTimer timer;
-            for (unsigned i=0; i < 0xffffff; i++)
-                total += numExtraBytesFromFirst1(i);
-            printf("%llu\n", timer.elapsedNs());
-        }
-        {
-            CCycleTimer timer;
-            for (unsigned i2=0; i2 < 0xffffff; i2++)
-                total += numExtraBytesFromFirst2(i2);
-            printf("%llu\n", timer.elapsedNs());
-        }
-        printf("%u\n", total);
-    }
-#endif
-
     void testSearching()
     {
         const size32_t keyLen = 8;
diff --git a/system/jhtree/keybuild.cpp b/system/jhtree/keybuild.cpp
index 6d08d881958..23d72c18b9e 100644
--- a/system/jhtree/keybuild.cpp
+++ b/system/jhtree/keybuild.cpp
@@ -271,16 +271,9 @@ class CKeyBuilder : public CInterfaceOf<IKeyBuilder>
     }
 
 protected:
-    offset_t endLevel(bool close)
+    void nextLevel()
     {
-        return 0;
-    }
-
-    offset_t nextLevel()
-    {
-        endLevel(false);
         levels++;
-        return 0;
     }
 
     void writeFileHeader(bool fixHdr, CRC32 *crc)
@@ -415,15 +408,8 @@ class CKeyBuilder : public CInterfaceOf<IKeyBuilder>
         if (children.ordinality() != 1)
         {
             // Note that we used to always create at least 2 levels as various places used to assume this.
-            offset_t offset = nextLevel();
-            if (offset)
-            {
-                ForEachItemIn(idx, children)
-                {
-                    CNodeInfo &info = children.item(idx);
-                    info.pos += offset;
-                }
-            }
+            nextLevel();
+
             NodeInfoArray parentInfo;
             buildLevel(children, parentInfo);
             buildTree(parentInfo);
diff --git a/system/lzma/LzmaEnc.cpp b/system/lzma/LzmaEnc.cpp
index 17bf8d4dae6..29461d6f6dc 100644
--- a/system/lzma/LzmaEnc.cpp
+++ b/system/lzma/LzmaEnc.cpp
@@ -1923,11 +1923,10 @@ static SRes LzmaEnc_CodeOneBlock(CLzmaEnc *p, Bool useLimits, UInt32 maxPackSize
 static SRes LzmaEnc_Alloc(CLzmaEnc *p, UInt32 keepWindowSize, ISzAlloc *alloc, ISzAlloc *allocBig)
 {
   UInt32 beforeSize = kNumOpts;
-  Bool btMode [[maybe_unused]];
   if (!RangeEnc_Alloc(&p->rc, alloc))
     return SZ_ERROR_MEM;
-  btMode = (p->matchFinderBase.btMode != 0);
   #ifdef COMPRESS_MF_MT
+  Bool btMode = (p->matchFinderBase.btMode != 0);
   p->mtMode = (p->multiThread && !p->fastMode && btMode);
   #endif