diff --git a/code/Decoder/Decoder.h b/code/Decoder/Decoder.h
index f1d9612..e3b79b4 100644
--- a/code/Decoder/Decoder.h
+++ b/code/Decoder/Decoder.h
@@ -63,12 +63,12 @@ class Decoder
 	// RTTY
 
 public:
-	typedef 	TReal												TValue;
-	typedef 	std::complex<TReal>									TComplex;
-	typedef 	std::vector<TReal>									TRVector;
-	typedef 	habdec::IQVector<TReal>								TIQVector;
-	typedef 	habdec::Decimator< std::complex<TReal>, TReal >		TDecimator;
-	typedef 	habdec::FirFilter< std::complex<TReal>, TReal>		TFIR;
+	using TValue =		TReal;
+	using TComplex =	std::complex<TReal>;
+	using TRVector =	std::vector<TReal>;
+	using TIQVector =	habdec::IQVector<TReal>;
+	using TDecimator =	habdec::Decimator< std::complex<TReal>, TReal >;
+	using TFIR =		habdec::FirFilter< std::complex<TReal>, TReal>;
 
 	// feed decoder
 	bool 	pushSamples(const TIQVector& i_stream);
@@ -128,6 +128,9 @@ public:
 	bool livePrint() const { return live_print_; }
 	void livePrint(bool i_live) { live_print_ = i_live; }
 
+	std::string ssdvBaseFile() const { return ssdv_.base_file(); }
+	void ssdvBaseFile(const std::string& _f)  { ssdv_.base_file(_f); }
+
 	// callback on each successfull sentence decode. callsign, sentence_data, CRC
 	std::function<void(std::string, std::string, std::string)> sentence_callback_;
 
@@ -137,9 +140,6 @@ public:
 	// callback on each decoded ssdv packet. callsign, image_id, jpeg_bytes
 	std::function<void(std::string, int, std::vector<uint8_t>)> ssdv_callback_;
 
-	// SSDV
-	SSDV_wraper_t 	ssdv_;
-
 private:
 	// IQ buffers
 	TIQVector			iq_in_buffer_;			// input IQ buffer
@@ -189,6 +189,9 @@ private:
 	std::string 	last_sentence_; // result of rtty
 	// size_t 		last_sentence_len_ = 0;  // optimization for regexp run
 
+	// SSDV
+	SSDV_wraper_t 	ssdv_;
+
 	// threading
 	mutable std::mutex	process_mutex_;		// mutex for main processing
 
diff --git a/code/Decoder/ssdv_wrapper.cpp b/code/Decoder/ssdv_wrapper.cpp
index 9254bb2..5ce2667 100644
--- a/code/Decoder/ssdv_wrapper.cpp
+++ b/code/Decoder/ssdv_wrapper.cpp
@@ -23,6 +23,7 @@
 #include <cstring>
 #include <iostream>
 #include <iomanip>
+#include <future>
 #include <ctime>
 #include <stdio.h>
 #include "../ssdv/ssdv.h"
@@ -151,21 +152,26 @@ void SSDV_wraper_t::save_jpeg( const image_key_t& image_key )
     if( jpegs_.find(image_key) == jpegs_.end() )
         return;
 
-    const auto& jpeg = jpegs_[image_key];
+    const auto jpeg = jpegs_[image_key];
+    const auto base_file = base_file_;
 
-    auto t = std::time(nullptr);
-    char timestamp[200];
-    strftime(timestamp, 200, "%Y-%m-%d", std::localtime(&t) );
+    async(launch::async, [&jpeg, &base_file, image_key](){
+        // timestamp
+        auto t = std::time(nullptr);
+        char timestamp[200];
+        strftime(timestamp, 200, "%Y-%m-%d", std::localtime(&t) );
+        // filename 0 padding
+        string img_id_pad = std::to_string(image_key.second);
+        img_id_pad = string(4 - img_id_pad.length(), '0') + img_id_pad;
+        string fname =  base_file + string(timestamp)
+                        + "_" + image_key.first
+                        + "_" + img_id_pad + ".jpeg";
 
-    string img_id_pad = std::to_string(image_key.second);
-    img_id_pad = string(4 - img_id_pad.length(), '0') + img_id_pad;
+        FILE* fh = fopen( fname.c_str(), "wb" );
+        fwrite(jpeg.data(), 1, jpeg.size(), fh);
+        fclose(fh);
+    });
 
-    string fname =  base_file_ + string(timestamp)
-                    + "_" + image_key.first
-                    + "_" + img_id_pad + ".jpeg";
-    FILE* fh = fopen( fname.c_str(), "wb" );
-    fwrite(jpeg.data(), 1, jpeg.size(), fh);
-    fclose(fh);
 }
 
 
diff --git a/code/websocketServer/main.cpp b/code/websocketServer/main.cpp
index f449458..da38681 100755
--- a/code/websocketServer/main.cpp
+++ b/code/websocketServer/main.cpp
@@ -239,8 +239,6 @@ void DECODER_THREAD()
 	//////
 	//
 
-	typedef std::chrono::nanoseconds TDur;
-
 	auto& DECODER = GLOBALS::get().decoder_;
 
 	habdec::IQVector<TReal>	samples;
@@ -249,8 +247,6 @@ void DECODER_THREAD()
 
 	while(1)
 	{
-		auto _start = std::chrono::high_resolution_clock::now();
-
 		size_t count = p_iq_src->get( samples.data(), samples.size() );
 		if(count)
 			samples.resize(count);
@@ -278,9 +274,6 @@ void DECODER_THREAD()
 			}
 		}
 
-
-		TDur _duration = std::chrono::duration_cast<TDur>(std::chrono::high_resolution_clock::now() - _start);
-
 		// accumulate demod samples to display more
 		{
 			std::lock_guard<std::mutex> _lock(GLOBALS::get().demod_accumulated_mtx_);
@@ -470,7 +463,7 @@ int main(int argc, char** argv)
 	DECODER.lowpass_trans( G.par_.lowpass_tr_ );
 	int _decim = G.par_.decimation_;
 	DECODER.setupDecimationStagesFactor( pow(2,_decim) );
-	DECODER.ssdv_.base_file( G.par_.ssdv_dir_ + "/ssdv_" );
+	DECODER.ssdvBaseFile( G.par_.ssdv_dir_ + "/ssdv_" );
 
 	double freq = G.par_.frequency_;
 	G.p_iq_source_->setOption("frequency_double", &freq);