diff --git a/builtin/checkout.c b/builtin/checkout.c
index 304f319fca42f7..6e284b89d637b9 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -17,6 +17,7 @@
 #include "merge-recursive.h"
 #include "object-name.h"
 #include "object-store-ll.h"
+#include "packfile.h"
 #include "parse-options.h"
 #include "path.h"
 #include "preload-index.h"
@@ -1044,8 +1045,13 @@ static void update_refs_for_switch(const struct checkout_opts *opts,
 	if (!opts->quiet &&
 	    !opts->force_detach &&
 	    (new_branch_info->path || !strcmp(new_branch_info->name, "HEAD"))) {
+		unsigned long nr_unpack_entry_at_start;
+
 		trace2_region_enter("exp", "report_tracking", the_repository);
+		nr_unpack_entry_at_start = get_nr_unpack_entry();
 		report_tracking(new_branch_info);
+		trace2_data_intmax("exp", NULL, "report_tracking/nr_unpack_entries",
+				   (intmax_t)(get_nr_unpack_entry() - nr_unpack_entry_at_start));
 		trace2_region_leave("exp", "report_tracking", the_repository);
 	}
 }
diff --git a/packfile.c b/packfile.c
index 813584646f762a..8adb82aaf11fcc 100644
--- a/packfile.c
+++ b/packfile.c
@@ -1667,6 +1667,13 @@ struct unpack_entry_stack_ent {
 	unsigned long size;
 };
 
+static unsigned long g_nr_unpack_entry;
+
+unsigned long get_nr_unpack_entry(void)
+{
+	return g_nr_unpack_entry;
+}
+
 void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
 		   enum object_type *final_type, unsigned long *final_size)
 {
@@ -1680,6 +1687,8 @@ void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
 	int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
 	int base_from_cache = 0;
 
+	g_nr_unpack_entry++;
+
 	write_pack_access_log(p, obj_offset);
 
 	/* PHASE 1: drill down to the innermost base object */
diff --git a/packfile.h b/packfile.h
index eb18ec15dbf3bc..11ce71a4f97912 100644
--- a/packfile.h
+++ b/packfile.h
@@ -210,4 +210,9 @@ int is_promisor_object(const struct object_id *oid);
 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
 	     size_t idx_size, struct packed_git *p);
 
+/*
+ * Return the number of objects fetched from a packfile.
+ */
+unsigned long get_nr_unpack_entry(void);
+
 #endif
diff --git a/unpack-trees.c b/unpack-trees.c
index 8289b2419f9989..410e58edf3af4e 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -16,6 +16,7 @@
 #include "tree-walk.h"
 #include "cache-tree.h"
 #include "unpack-trees.h"
+#include "packfile.h"
 #include "progress.h"
 #include "refs.h"
 #include "attr.h"
@@ -1897,6 +1898,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 	struct pattern_list pl;
 	int free_pattern_list = 0;
 	struct dir_struct dir = DIR_INIT;
+	unsigned long nr_unpack_entry_at_start;
 
 	if (o->reset == UNPACK_RESET_INVALID)
 		BUG("o->reset had a value of 1; should be UNPACK_TREES_*_UNTRACKED");
@@ -1911,6 +1913,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 		BUG("o->df_conflict_entry is an output only field");
 
 	trace2_region_enter("exp", "unpack_trees", NULL);
+	nr_unpack_entry_at_start = get_nr_unpack_entry();
 
 	trace_performance_enter();
 	trace2_region_enter("unpack_trees", "unpack_trees", the_repository);
@@ -2116,6 +2119,8 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
 	}
 	trace2_region_leave("unpack_trees", "unpack_trees", the_repository);
 	trace_performance_leave("unpack_trees");
+	trace2_data_intmax("unpack_trees", NULL, "unpack_trees/nr_unpack_entries",
+			   (intmax_t)(get_nr_unpack_entry() - nr_unpack_entry_at_start));
 	trace2_region_leave("exp", "unpack_trees", NULL);
 	return ret;