diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index 035eb24ac..0aada8e28 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -25,6 +25,7 @@
 #include <thread>
 #include <mutex>
 #include <chrono>
+#include <condition_variable>
 
 #ifndef SERVER_VERBOSE
 #define SERVER_VERBOSE 1
@@ -541,7 +542,9 @@ struct llama_server_context
     std::vector<task_result> queue_results;
     std::vector<task_multi>  queue_multitasks;
     std::mutex mutex_tasks; // also guards id_gen, and queue_multitasks
+    std::condition_variable condition_tasks;
     std::mutex mutex_results;
+    std::condition_variable condition_results;
 
     ~llama_server_context()
     {
@@ -1169,7 +1172,7 @@ struct llama_server_context
 
     void send_error(task_server& task, std::string error)
     {
-        std::lock_guard<std::mutex> lock(mutex_results);
+        std::unique_lock<std::mutex> lock(mutex_results);
         task_result res;
         res.id = task.id;
         res.multitask_id = task.multitask_id;
@@ -1177,6 +1180,7 @@ struct llama_server_context
         res.error = true;
         res.result_json = { { "content", error } };
         queue_results.push_back(res);
+        condition_results.notify_all();
     }
 
     void add_multi_task(int id, std::vector<int>& sub_ids)
@@ -1186,6 +1190,7 @@ struct llama_server_context
         multi.id = id;
         std::copy(sub_ids.begin(), sub_ids.end(), std::inserter(multi.subtasks_remaining, multi.subtasks_remaining.end()));
         queue_multitasks.push_back(multi);
+        condition_tasks.notify_one();
     }
 
     void update_multi_task(int multitask_id, int subtask_id, task_result& result)
@@ -1197,6 +1202,7 @@ struct llama_server_context
             {
                 multitask.subtasks_remaining.erase(subtask_id);
                 multitask.results.push_back(result);
+                condition_tasks.notify_one();
             }
         }
     }
@@ -1244,7 +1250,7 @@ struct llama_server_context
 
     void send_partial_response(llama_client_slot &slot, completion_token_output tkn)
     {
-        std::lock_guard<std::mutex> lock(mutex_results);
+        std::unique_lock<std::mutex> lock(mutex_results);
         task_result res;
         res.id = slot.task_id;
         res.multitask_id = slot.multitask_id;
@@ -1280,11 +1286,12 @@ struct llama_server_context
         }
 
         queue_results.push_back(res);
+        condition_results.notify_all();
     }
 
     void send_final_response(llama_client_slot &slot)
     {
-        std::lock_guard<std::mutex> lock(mutex_results);
+        std::unique_lock<std::mutex> lock(mutex_results);
         task_result res;
         res.id = slot.task_id;
         res.multitask_id = slot.multitask_id;
@@ -1340,11 +1347,12 @@ struct llama_server_context
         }
 
         queue_results.push_back(res);
+        condition_results.notify_all();
     }
 
     void send_embedding(llama_client_slot &slot)
     {
-        std::lock_guard<std::mutex> lock(mutex_results);
+        std::unique_lock<std::mutex> lock(mutex_results);
         task_result res;
         res.id = slot.task_id;
         res.multitask_id = slot.multitask_id;
@@ -1372,6 +1380,7 @@ struct llama_server_context
             };
         }
         queue_results.push_back(res);
+        condition_results.notify_all();
     }
 
     int request_completion(json data, bool infill, bool embedding, int multitask_id)
@@ -1395,6 +1404,7 @@ struct llama_server_context
 
         // otherwise, it's a single-prompt task, we actually queue it
         queue_tasks.push_back(task);
+        condition_tasks.notify_one();
         return task.id;
     }
 
@@ -1402,13 +1412,10 @@ struct llama_server_context
     {
         while (true)
         {
-            std::this_thread::sleep_for(std::chrono::microseconds(5));
-            std::lock_guard<std::mutex> lock(mutex_results);
-
-            if (queue_results.empty())
-            {
-                continue;
-            }
+            std::unique_lock<std::mutex> lock(mutex_results);
+            condition_results.wait(lock, [&]{
+                return !queue_results.empty();
+            });
 
             for (int i = 0; i < (int) queue_results.size(); i++)
             {
@@ -1504,12 +1511,13 @@ struct llama_server_context
 
     void request_cancel(int task_id)
     {
-        std::lock_guard<std::mutex> lock(mutex_tasks);
+        std::unique_lock<std::mutex> lock(mutex_tasks);
         task_server task;
         task.id = id_gen++;
         task.type = CANCEL_TASK;
         task.target_id = task_id;
         queue_tasks.push_back(task);
+        condition_tasks.notify_one();
     }
 
     int split_multiprompt_task(task_server& multiprompt_task)
@@ -1535,7 +1543,7 @@ struct llama_server_context
 
     void process_tasks()
     {
-        std::lock_guard<std::mutex> lock(mutex_tasks);
+        std::unique_lock<std::mutex> lock(mutex_tasks);
         while (!queue_tasks.empty())
         {
             task_server task = queue_tasks.front();
@@ -1607,6 +1615,7 @@ struct llama_server_context
 
                 std::lock_guard<std::mutex> lock(mutex_results);
                 queue_results.push_back(aggregate_result);
+                condition_results.notify_all();
 
                 queue_iterator = queue_multitasks.erase(queue_iterator);
             }
@@ -1637,8 +1646,10 @@ struct llama_server_context
                 LOG_TEE("all slots are idle and system prompt is empty, clear the KV cache\n");
                 kv_cache_clear();
             }
-            // avoid 100% usage of cpu all time
-            std::this_thread::sleep_for(std::chrono::milliseconds(5));
+            std::unique_lock<std::mutex> lock(mutex_tasks);
+            condition_tasks.wait(lock, [&]{
+                return !queue_tasks.empty();
+            });
         }
 
         for (llama_client_slot &slot : slots)