diff --git a/src/Commands/Apply.cs b/src/Commands/Apply.cs
index 189d4335..ca6ffe8d 100644
--- a/src/Commands/Apply.cs
+++ b/src/Commands/Apply.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class Apply : Command
     {
@@ -6,14 +8,19 @@
         {
             WorkingDirectory = repo;
             Context = repo;
-            Args = "apply ";
+
+            var builder = new StringBuilder(1024);
+            builder.Append("apply ");
+
             if (ignoreWhitespace)
-                Args += "--ignore-whitespace ";
+                builder.Append("--ignore-whitespace ");
             else
-                Args += $"--whitespace={whitespaceMode} ";
+                builder.Append("--whitespace=").Append(whitespaceMode).Append(' ');
+
             if (!string.IsNullOrEmpty(extra))
-                Args += $"{extra} ";
-            Args += $"{file.Quoted()}";
+                builder.Append(extra).Append(' ');
+
+            Args = builder.Append(file.Quoted()).ToString();
         }
     }
 }
diff --git a/src/Commands/CherryPick.cs b/src/Commands/CherryPick.cs
index 0c82b9fd..d9d4faea 100644
--- a/src/Commands/CherryPick.cs
+++ b/src/Commands/CherryPick.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class CherryPick : Command
     {
@@ -7,14 +9,16 @@
             WorkingDirectory = repo;
             Context = repo;
 
-            Args = "cherry-pick ";
+            var builder = new StringBuilder(1024);
+            builder.Append("cherry-pick ");
             if (noCommit)
-                Args += "-n ";
+                builder.Append("-n ");
             if (appendSourceToMessage)
-                Args += "-x ";
+                builder.Append("-x ");
             if (!string.IsNullOrEmpty(extraParams))
-                Args += $"{extraParams} ";
-            Args += commits;
+                builder.Append(extraParams).Append(' ');
+
+            Args = builder.Append(commits).ToString();
         }
     }
 }
diff --git a/src/Commands/Clone.cs b/src/Commands/Clone.cs
index efec264b..ec3c4594 100644
--- a/src/Commands/Clone.cs
+++ b/src/Commands/Clone.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class Clone : Command
     {
@@ -7,15 +9,16 @@
             Context = ctx;
             WorkingDirectory = path;
             SSHKey = sshKey;
-            Args = "clone --progress --verbose ";
 
+            var builder = new StringBuilder(1024);
+            builder.Append("clone --progress --verbose ");
             if (!string.IsNullOrEmpty(extraArgs))
-                Args += $"{extraArgs} ";
-
-            Args += $"{url} ";
-
+                builder.Append(extraArgs).Append(' ');
+            builder.Append(url).Append(' ');
             if (!string.IsNullOrEmpty(localName))
-                Args += localName;
+                builder.Append(localName);
+
+            Args = builder.ToString();
         }
     }
 }
diff --git a/src/Commands/Command.cs b/src/Commands/Command.cs
index 0996a030..520f1970 100644
--- a/src/Commands/Command.cs
+++ b/src/Commands/Command.cs
@@ -190,7 +190,7 @@ namespace SourceGit.Commands
                 start.Environment.Add("LC_ALL", "C");
             }
 
-            var builder = new StringBuilder();
+            var builder = new StringBuilder(2048);
             builder
                 .Append("--no-pager -c core.quotepath=off -c credential.helper=")
                 .Append(Native.OS.CredentialHelper)
diff --git a/src/Commands/Fetch.cs b/src/Commands/Fetch.cs
index 9ec27656..9a599f82 100644
--- a/src/Commands/Fetch.cs
+++ b/src/Commands/Fetch.cs
@@ -1,4 +1,5 @@
-using System.Threading.Tasks;
+using System.Text;
+using System.Threading.Tasks;
 
 namespace SourceGit.Commands
 {
@@ -6,26 +7,24 @@ namespace SourceGit.Commands
     {
         public Fetch(string repo, string remote, bool noTags, bool force)
         {
-            _remoteKey = $"remote.{remote}.sshkey";
+            _remote = remote;
 
             WorkingDirectory = repo;
             Context = repo;
-            Args = "fetch --progress --verbose ";
-
-            if (noTags)
-                Args += "--no-tags ";
-            else
-                Args += "--tags ";
 
+            var builder = new StringBuilder(512);
+            builder.Append("fetch --progress --verbose ");
+            builder.Append(noTags ? "--no-tags " : "--tags ");
             if (force)
-                Args += "--force ";
+                builder.Append("--force ");
+            builder.Append(remote);
 
-            Args += remote;
+            Args = builder.ToString();
         }
 
         public Fetch(string repo, Models.Branch local, Models.Branch remote)
         {
-            _remoteKey = $"remote.{remote.Remote}.sshkey";
+            _remote = remote.Remote;
 
             WorkingDirectory = repo;
             Context = repo;
@@ -34,10 +33,10 @@ namespace SourceGit.Commands
 
         public async Task<bool> RunAsync()
         {
-            SSHKey = await new Config(WorkingDirectory).GetAsync(_remoteKey).ConfigureAwait(false);
+            SSHKey = await new Config(WorkingDirectory).GetAsync($"remote.{_remote}.sshkey").ConfigureAwait(false);
             return await ExecAsync().ConfigureAwait(false);
         }
 
-        private readonly string _remoteKey;
+        private readonly string _remote;
     }
 }
diff --git a/src/Commands/InteractiveRebase.cs b/src/Commands/InteractiveRebase.cs
index ebcadec1..7e4ca86b 100644
--- a/src/Commands/InteractiveRebase.cs
+++ b/src/Commands/InteractiveRebase.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class InteractiveRebase : Command
     {
@@ -7,10 +9,13 @@
             WorkingDirectory = repo;
             Context = repo;
             Editor = EditorType.RebaseEditor;
-            Args = "rebase -i --autosquash ";
+
+            var builder = new StringBuilder(512);
+            builder.Append("rebase -i --autosquash ");
             if (autoStash)
-                Args += "--autostash ";
-            Args += basedOn;
+                builder.Append("--autostash ");
+
+            Args = builder.Append(basedOn).ToString();
         }
     }
 }
diff --git a/src/Commands/Pull.cs b/src/Commands/Pull.cs
index 93896c75..e121445b 100644
--- a/src/Commands/Pull.cs
+++ b/src/Commands/Pull.cs
@@ -1,4 +1,5 @@
-using System.Threading.Tasks;
+using System.Text;
+using System.Threading.Tasks;
 
 namespace SourceGit.Commands
 {
@@ -10,12 +11,14 @@ namespace SourceGit.Commands
 
             WorkingDirectory = repo;
             Context = repo;
-            Args = "pull --verbose --progress ";
 
+            var builder = new StringBuilder(512);
+            builder.Append("pull --verbose --progress ");
             if (useRebase)
-                Args += "--rebase=true ";
+                builder.Append("--rebase=true ");
+            builder.Append(remote).Append(' ').Append(branch);
 
-            Args += $"{remote} {branch}";
+            Args = builder.ToString();
         }
 
         public async Task<bool> RunAsync()
diff --git a/src/Commands/Push.cs b/src/Commands/Push.cs
index b822af46..44394dc4 100644
--- a/src/Commands/Push.cs
+++ b/src/Commands/Push.cs
@@ -1,4 +1,5 @@
-using System.Threading.Tasks;
+using System.Text;
+using System.Threading.Tasks;
 
 namespace SourceGit.Commands
 {
@@ -10,18 +11,20 @@ namespace SourceGit.Commands
 
             WorkingDirectory = repo;
             Context = repo;
-            Args = "push --progress --verbose ";
 
+            var builder = new StringBuilder(1024);
+            builder.Append("push --progress --verbose ");
             if (withTags)
-                Args += "--tags ";
+                builder.Append("--tags ");
             if (checkSubmodules)
-                Args += "--recurse-submodules=check ";
+                builder.Append("--recurse-submodules=check ");
             if (track)
-                Args += "-u ";
+                builder.Append("-u ");
             if (force)
-                Args += "--force-with-lease ";
+                builder.Append("--force-with-lease ");
 
-            Args += $"{remote} {local}:{remoteBranch}";
+            builder.Append(remote).Append(' ').Append(local).Append(':').Append(remoteBranch);
+            Args = builder.ToString();
         }
 
         public Push(string repo, string remote, string refname, bool isDelete)
@@ -30,12 +33,14 @@ namespace SourceGit.Commands
 
             WorkingDirectory = repo;
             Context = repo;
-            Args = "push ";
 
+            var builder = new StringBuilder(512);
+            builder.Append("push ");
             if (isDelete)
-                Args += "--delete ";
+                builder.Append("--delete ");
+            builder.Append(remote).Append(' ').Append(refname);
 
-            Args += $"{remote} {refname}";
+            Args = builder.ToString();
         }
 
         public async Task<bool> RunAsync()
diff --git a/src/Commands/QueryCommits.cs b/src/Commands/QueryCommits.cs
index a92262d5..0e46ead8 100644
--- a/src/Commands/QueryCommits.cs
+++ b/src/Commands/QueryCommits.cs
@@ -8,12 +8,12 @@ namespace SourceGit.Commands
 {
     public class QueryCommits : Command
     {
-        public QueryCommits(string repo, string limits, bool needFindHead = true)
+        public QueryCommits(string repo, string limits, bool markMerged = true)
         {
             WorkingDirectory = repo;
             Context = repo;
             Args = $"log --no-show-signature --decorate=full --format=%H%x00%P%x00%D%x00%aN±%aE%x00%at%x00%cN±%cE%x00%ct%x00%s {limits}";
-            _findFirstMerged = needFindHead;
+            _markMerged = markMerged;
         }
 
         public QueryCommits(string repo, string filter, Models.CommitSearchMethod method, bool onlyCurrentBranch)
@@ -51,7 +51,7 @@ namespace SourceGit.Commands
             WorkingDirectory = repo;
             Context = repo;
             Args = builder.ToString();
-            _findFirstMerged = false;
+            _markMerged = false;
         }
 
         public async Task<List<Models.Commit>> GetResultAsync()
@@ -63,6 +63,7 @@ namespace SourceGit.Commands
                 proc.StartInfo = CreateGitStartInfo(true);
                 proc.Start();
 
+                var findHead = false;
                 while (await proc.StandardOutput.ReadLineAsync().ConfigureAwait(false) is { } line)
                 {
                     var parts = line.Split('\0');
@@ -79,13 +80,12 @@ namespace SourceGit.Commands
                     commit.Subject = parts[7];
                     commits.Add(commit);
 
-                    if (commit.IsMerged && !_isHeadFound)
-                        _isHeadFound = true;
+                    findHead |= commit.IsMerged;
                 }
 
                 await proc.WaitForExitAsync().ConfigureAwait(false);
 
-                if (_findFirstMerged && !_isHeadFound && commits.Count > 0)
+                if (_markMerged && !findHead && commits.Count > 0)
                 {
                     var set = await new QueryCurrentBranchCommitHashes(WorkingDirectory, commits[^1].CommitterTime)
                         .GetResultAsync()
@@ -109,7 +109,6 @@ namespace SourceGit.Commands
             return commits;
         }
 
-        private bool _findFirstMerged = false;
-        private bool _isHeadFound = false;
+        private bool _markMerged = false;
     }
 }
diff --git a/src/Commands/QueryRevisionObjects.cs b/src/Commands/QueryRevisionObjects.cs
index e6463750..a7eaaa9e 100644
--- a/src/Commands/QueryRevisionObjects.cs
+++ b/src/Commands/QueryRevisionObjects.cs
@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
@@ -14,10 +15,13 @@ namespace SourceGit.Commands
         {
             WorkingDirectory = repo;
             Context = repo;
-            Args = $"ls-tree {sha}";
 
+            var builder = new StringBuilder(1024);
+            builder.Append("ls-tree ").Append(sha);
             if (!string.IsNullOrEmpty(parentFolder))
-                Args += $" -- {parentFolder.Quoted()}";
+                builder.Append(" -- ").Append(parentFolder.Quoted());
+
+            Args = builder.ToString();
         }
 
         public async Task<List<Models.Object>> GetResultAsync()
diff --git a/src/Commands/Rebase.cs b/src/Commands/Rebase.cs
index d08d55ad..f7f33ac5 100644
--- a/src/Commands/Rebase.cs
+++ b/src/Commands/Rebase.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class Rebase : Command
     {
@@ -6,10 +8,13 @@
         {
             WorkingDirectory = repo;
             Context = repo;
-            Args = "rebase ";
+
+            var builder = new StringBuilder(512);
+            builder.Append("rebase ");
             if (autoStash)
-                Args += "--autostash ";
-            Args += basedOn;
+                builder.Append("--autostash ");
+
+            Args = builder.Append(basedOn).ToString();
         }
     }
 }
diff --git a/src/Commands/Revert.cs b/src/Commands/Revert.cs
index 2e7afd11..f42a62d0 100644
--- a/src/Commands/Revert.cs
+++ b/src/Commands/Revert.cs
@@ -1,4 +1,6 @@
-namespace SourceGit.Commands
+using System.Text;
+
+namespace SourceGit.Commands
 {
     public class Revert : Command
     {
@@ -6,9 +8,16 @@
         {
             WorkingDirectory = repo;
             Context = repo;
-            Args = $"revert -m 1 {commit} --no-edit";
+
+            var builder = new StringBuilder(512);
+            builder
+                .Append("revert -m 1 ")
+                .Append(commit)
+                .Append(" --no-edit");
             if (!autoCommit)
-                Args += " --no-commit";
+                builder.Append(" --no-commit");
+
+            Args = builder.ToString();
         }
     }
 }
diff --git a/src/Commands/Worktree.cs b/src/Commands/Worktree.cs
index 1c3f8915..50ee9724 100644
--- a/src/Commands/Worktree.cs
+++ b/src/Commands/Worktree.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Text;
 using System.Threading.Tasks;
 
 namespace SourceGit.Commands
@@ -65,26 +66,20 @@ namespace SourceGit.Commands
 
         public async Task<bool> AddAsync(string fullpath, string name, bool createNew, string tracking)
         {
-            Args = "worktree add ";
-
+            var builder = new StringBuilder(1024);
+            builder.Append("worktree add ");
             if (!string.IsNullOrEmpty(tracking))
-                Args += "--track ";
-
+                builder.Append("--track ");
             if (!string.IsNullOrEmpty(name))
-            {
-                if (createNew)
-                    Args += $"-b {name} ";
-                else
-                    Args += $"-B {name} ";
-            }
-
-            Args += $"{fullpath.Quoted()} ";
+                builder.Append(createNew ? "-b " : "-B ").Append(name).Append(' ');
+            builder.Append(fullpath.Quoted()).Append(' ');
 
             if (!string.IsNullOrEmpty(tracking))
-                Args += tracking;
+                builder.Append(tracking);
             else if (!string.IsNullOrEmpty(name) && !createNew)
-                Args += name;
+                builder.Append(name);
 
+            Args = builder.ToString();
             return await ExecAsync().ConfigureAwait(false);
         }