diff --git a/gpttype_adapter.cpp b/gpttype_adapter.cpp
index 64b537290..d5d5d8d0c 100644
--- a/gpttype_adapter.cpp
+++ b/gpttype_adapter.cpp
@@ -839,6 +839,9 @@ int mirostat, float mirostat_tau, float mirostat_eta, float dry_multiplier, floa
         sample_grammar(file_format, n_vocab, &candidates_p, grammar);
     }
 
+    //prefilter to top 5k tokens for improved speed
+    llama_sample_top_k(nullptr, &candidates_p, 5000, 1);
+
     if (mirostat == 1 || mirostat == 2)
     {
         static float mirostat_mu = 2.0f * mirostat_tau;