diff --git a/application.cpp b/application.cpp
index c191295..7e208f4 100644
--- a/application.cpp
+++ b/application.cpp
@@ -24,7 +24,7 @@
 #include <curl/curl.h>
 #include <nlohmann/json.hpp>
 
-static std::string user_home;
+std::string user_home;
 
 std::vector<UserFlag> userFlags;
 std::vector<Channel> channels;
@@ -60,6 +60,7 @@ void draw_channel_list(const std::vector<Video> &videos, bool show_channel_name=
     const size_t available_rows = rows - 2;
     videos_per_page = available_rows;
     const int cur_page = selected_video / available_rows;
+    const int pages = videos.size() / available_rows;
 
     size_t cur_entry = 0;
 
@@ -87,9 +88,7 @@ void draw_channel_list(const std::vector<Video> &videos, bool show_channel_name=
     const size_t last_name_column = cols;
     const size_t name_quater = (last_name_column - first_name_column) / 4;
 
-    const int pages = videos.size() / available_rows;
-
-    const std::string channel_name = std::string("Channel: ") + channels[selected_channel].name.c_str();
+    const std::string channel_name = std::string("Channel: ") + channels[selected_channel].name;
     termpaint_surface_write_with_attr(surface, 0, 0, channel_name.c_str(), get_attr(ASNormal));
 
     if(pages > 1) {
@@ -324,15 +323,16 @@ void action_add_channel_by_id()
 }
 
 void action_select_channel() {
-    if(channels.size()) {
+    if(channels.empty()) {
+        message_box("Can't select channel", "No channels configured.\n Please configure one.");
+    } else {
         std::vector<std::string> names;
+        names.reserve(channels.size());
         for(const Channel &c: channels)
             names.push_back(c.name + " (" + std::to_string(c.unwatched) + ")");
         const int channel = get_selection("Switch Channel", names, selected_channel, Align::VCenter | Align::Left);
         if(channel != -1)
             select_channel_by_index(channel);
-    } else {
-        message_box("Can't select channel", "No channels configured.\n Please configure one.");
     }
 }
 
@@ -387,7 +387,7 @@ void action_refresh_channel() {
     } else {
         if(host && host->notify_channel_multiple_videos) {
             host->notify_channel_multiple_videos(ch.name, new_videos);
-        } else if(notify_channel_new_videos_command.size()) {
+        } else if(!notify_channel_new_videos_command.empty()) {
             run_command(notify_channel_new_videos_command, {
                             {"{{channelName}}", ch.name},
                             {"{{newVideos}}", std::to_string(new_videos)}
@@ -397,7 +397,7 @@ void action_refresh_channel() {
 }
 
 void action_refresh_all_channels(bool ask=true) {
-    if(ask && message_box("Refresh all channels?", ("Do you want to refresh all " + std::to_string(channels.size()) + " channels?").c_str(), Button::Yes | Button::No, Button::No) != Button::Yes)
+    if(ask && message_box("Refresh all channels?", "Do you want to refresh all " + std::to_string(channels.size()) + " channels?", Button::Yes | Button::No, Button::No) != Button::Yes)
         return;
     int updated_channels = 0;
     int new_videos = 0;
@@ -449,7 +449,7 @@ void action_mark_video_unwatched() {
 
 void action_mark_all_videos_watched() {
     Channel &ch = channels.at(selected_channel);
-    if(message_box("Mark all as watched", ("Do you want to mark all videos of " + ch.name + " as watched?").c_str(), Button::Yes | Button::No, Button::No) != Button::Yes)
+    if(message_box("Mark all as watched", "Do you want to mark all videos of " + ch.name + " as watched?", Button::Yes | Button::No, Button::No) != Button::Yes)
         return;
     {
         db_transaction transaction;
@@ -727,7 +727,7 @@ static void run()
         add_channel_to_list(channel);
     }
 
-    if(channels.size()) {
+    if(!channels.empty()) {
         select_channel_by_index(0);
     }
 
diff --git a/db.cpp b/db.cpp
index 9daf788..f6515d2 100644
--- a/db.cpp
+++ b/db.cpp
@@ -86,7 +86,7 @@ std::string db_get_setting(const std::string &key)
     SC(sqlite3_prepare_v2(db, "SELECT value FROM settings WHERE key = ?1;", -1, &query, nullptr));
     SC(sqlite3_bind_text(query, 1, key.c_str(), -1, SQLITE_TRANSIENT));
     SC(sqlite3_step(query));
-    const std::string value = get_string(query, 0);
+    std::string value = get_string(query, 0);
     SC(sqlite3_finalize(query));
     return value;
 }
diff --git a/tui.cpp b/tui.cpp
index 92188bc..452d12d 100644
--- a/tui.cpp
+++ b/tui.cpp
@@ -641,7 +641,7 @@ std::string text_wrap(const std::string &text, const size_t desired_width)
     return out;
 }
 
-void tui_abort(std::string message)
+void tui_abort(const std::string &message)
 {
     const size_t cols = termpaint_surface_width(surface);
 
@@ -705,7 +705,7 @@ static void draw_help(const std::vector<helpitem> &items)
         to_show.append("\n");
     }
 
-    message_box("Help", to_show.c_str());
+    message_box("Help", to_show);
 }
 
 static std::string format_key(const action &action) {
diff --git a/tui.h b/tui.h
index f60852e..2529112 100644
--- a/tui.h
+++ b/tui.h
@@ -88,5 +88,5 @@ progress_info* begin_progress(const std::string &caption, const int width, const
 void update_progress(progress_info *info, const int val, const int maxval);
 void end_progress(progress_info *info);
 
-void tui_abort(std::string message);
+void tui_abort(const std::string &message);
 void tui_abort(const char *fmt, ...);
diff --git a/yt.cpp b/yt.cpp
index 53e1132..031b5cd 100644
--- a/yt.cpp
+++ b/yt.cpp
@@ -78,18 +78,21 @@ static size_t curl_writecallback(void *data, size_t size, size_t nmemb, void *us
     return to_add;
 }
 
-static json api_request(const std::string &url, std::map<std::string, std::string> params)
+static json api_request(const std::string &url, const std::map<std::string, std::string> &params)
 {
     CURL *curl = curl_easy_init();
     curl_slist *headers = nullptr;
     for(const auto &[header, value]: yt_config.extra_headers) {
-        headers = curl_slist_append(headers, (header + ": " + value).c_str());
+        std::string h = header;
+        h.append(": ").append(value);
+        headers = curl_slist_append(headers, h.c_str());
     }
 
     CURLU *u = curl_url();
     curl_url_set(u, CURLUPART_URL, url.c_str(), 0);
     for(const auto &[k, v]: params) {
-        std::string p = k + "=" + v;
+        std::string p = k;
+        p.append("=").append(v);
         curl_url_set(u, CURLUPART_QUERY, p.c_str(), CURLU_APPENDQUERY|CURLU_URLENCODE);
     }
     char *real_url;
diff --git a/yttui-qt5.cpp b/yttui-qt5.cpp
index c5288bf..224dbb0 100644
--- a/yttui-qt5.cpp
+++ b/yttui-qt5.cpp
@@ -182,7 +182,7 @@ int main(int argc, char *argv[])
     };
 
     appthread.start();
-    int rc = app.exec();
+    int rc = QApplication::exec();
     close(term_fd);
     close(app_fd);