diff --git a/src/blake3/original-blake.hpp b/src/blake3/original-blake.hpp
index 6a40989..1af0a9e 100644
--- a/src/blake3/original-blake.hpp
+++ b/src/blake3/original-blake.hpp
@@ -352,7 +352,6 @@ __global__ void blake3_hasher_mine(void *global_hasher)
 
         if (check_hash(hasher->hash, hasher->target, hasher->from_group, hasher->to_group))
         {
-            printf("tid %d found it !!\n", tid);
             if (atomicCAS(&reinterpret_cast<blake3_hasher*>(global_hasher)->found_good_hash, 0, 1) == 0)
             {
                 copy_good_nonce(hasher, reinterpret_cast<blake3_hasher*>(global_hasher));
diff --git a/src/main.cu b/src/main.cu
index dedf708..04c3af9 100644
--- a/src/main.cu
+++ b/src/main.cu
@@ -410,7 +410,7 @@ int main(int argc, char **argv)
 
     uv_timer_t log_timer;
     uv_timer_init(loop, &log_timer);
-    uv_timer_start(&log_timer, log_hashrate, 5000, 5000);
+    uv_timer_start(&log_timer, log_hashrate, 5000, 20000);
 
     uv_run(loop, UV_RUN_DEFAULT);
 
diff --git a/src/template.h b/src/template.h
index 810bd4e..1a67fcb 100644
--- a/src/template.h
+++ b/src/template.h
@@ -84,7 +84,6 @@ bool expire_template_for_new_block(mining_template_t *template_ptr)
 
     mining_template_t *latest_template = load_template(chain_index);
     if (latest_template) {
-        printf("new solution found, remove the outdated template\n");
         store_template(chain_index, NULL);
         free_template(latest_template);
         return true;
diff --git a/src/worker.h b/src/worker.h
index aaed57c..3776428 100644
--- a/src/worker.h
+++ b/src/worker.h
@@ -185,7 +185,6 @@ ssize_t write_new_block(mining_worker_t *worker, uint8_t *write_buf) {
     ssize_t block_size = 24 + job->header_blob.len + job->txs_blob.len;
     ssize_t message_size = 1 + 4 + block_size;
 
-    printf("message: %zd\n", message_size);
     write_size(&write_pos, message_size);
     write_byte(&write_pos, 0); // message type
     write_size(&write_pos, block_size);