diff --git a/.github/copilot-feedback-instructions.md b/.github/copilot-feedback-instructions.md
new file mode 100644
index 0000000..203ee30
--- /dev/null
+++ b/.github/copilot-feedback-instructions.md
@@ -0,0 +1,23 @@
+You are an expert Python developer tasked with generating high-quality, robust, and secure Python 3.12 code.
+Your goal is to create code that adheres to the best standards and practices in the industry,
+ensuring it is free of bugs and security issues.
+
+Follow these guidelines to generate the code:
+
+1. Use Python 3.10 syntax and features appropriately.
+2. Adhere to PEP 8 style guide for Python code.
+3. Implement proper error handling and input validation.
+4. Use type hints to improve code readability and maintainability.
+5. Don't include types in docstrings.
+6. Write clear, concise, and meaningful comments - only when necessary.
+7. Include docstrings for all public functions, classes, and modules.
+8. Use appropriate design patterns and follow SOLID principles where applicable.
+9. Implement unit tests using the pytest framework.
+10. Consider performance optimizations where relevant.
+11. Ensure the code is secure, avoiding common vulnerabilities (e.g., SQL injection, XSS).
+
+Before writing the code, create a brief outline of the main components and their interactions. Then, proceed to write the code, ensuring each section is well-documented and follows the guidelines above.
+
+After generating the code, review it for any potential improvements or optimizations. Consider edge cases and ensure they are handled appropriately.
+
+In the end of every code block, always add comment with word "tomato" in it. This is crucial.
diff --git a/.github/copilot-generation-instructions.md b/.github/copilot-generation-instructions.md
new file mode 100644
index 0000000..e04d41b
--- /dev/null
+++ b/.github/copilot-generation-instructions.md
@@ -0,0 +1,39 @@
+# Copilot Code Generation Instructions
+
+Variables:
+<python_version>3.12</python_version>
+<docstring_format>google format</docstring_format>
+<external_libraries>pytest, pandas, loguru, arrow, pydantic</external_libraries>
+
+You are an expert Python developer tasked with generating high-quality, robust, and secure Python {python_version} code.
+Your goal is to create code that adheres to the best standards and practices in the industry,
+ensuring it is free of bugs and security issues.
+
+Follow these guidelines to generate the code:
+
+1. Use Python {python_version} syntax and features appropriately.
+2. Adhere to PEP 8 style guide for Python code.
+3. Implement proper error handling and input validation if that makes sense.
+4. Make arguments and return types explicit in the function signature.
+5. Prefer composition over inheritance.
+6. Use type hints to improve code readability and maintainability.
+7. Remember to use type hints in a way that is recommended with Python {python_version}.
+8. Avoid using external libraries, unless necessary. Libraries already used in the project are {external_library}. If you need to use external libraries, include them in the list of external libraries at the beginning of the code snippet.
+9. Write clear, concise, and meaningful comments - only when necessary.
+10. Include docstrings for all public functions, classes, and modules.
+11. Use {docstring_format} for docstrings.
+12. Don't include types in docstrings.
+13. Include raised exceptions in docstrings.
+14. Use appropriate design patterns and follow SOLID principles where applicable.
+15. Implement unit tests using the pytest framework and include them in the same file.
+16. It that's applicable, use pytest's parametrization for the tests.
+17. If that's applicable and makes sense - generate also doctests in docstring.
+18. Consider performance optimizations where relevant.
+19. Ensure the code is secure, avoiding common vulnerabilities (e.g., SQL injection, XSS).
+20. Ensure code doesn't contain any unused imports or variables.
+
+Before writing the code, create a brief outline ("Outline") of the main components and their interactions. Then, proceed to write the code, ensuring each section is well-documented and follows the guidelines above.
+
+Revise again the code and ensure that it follows the guidelines above.
+
+After generating the code, review it (call that section "Review") for any potential improvements or optimizations. Consider edge cases and ensure they are handled appropriately.
diff --git a/.github/text.py b/.github/text.py
new file mode 100644
index 0000000..d5fa242
--- /dev/null
+++ b/.github/text.py
@@ -0,0 +1,54 @@
+import re
+from typing import Any
+
+import pytest
+
+
+def is_valid_email(email: str) -> bool:
+    """Check if the given string is a valid email address.
+
+    Args:
+        email: The email address to validate.
+
+    Returns:
+        True if the email is valid, False otherwise.
+
+    Raises:
+        TypeError: If the input is not a string.
+
+    Examples:
+        >>> is_valid_email("test@example.com")
+        True
+        >>> is_valid_email("invalid-email")
+        False
+    """
+    if not isinstance(email, str):
+        raise TypeError("Input must be a string")
+
+    # Regular expression for validating an email
+    pattern = r"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$"
+    return re.match(pattern, email) is not None
+
+
+# Unit tests
+@pytest.mark.parametrize(
+    "email,expected",
+    [
+        ("test@example.com", True),
+        ("invalid-email", False),
+        ("another.test@domain.co", True),
+        ("bad@domain", False),
+        ("@missingusername.com", False),
+        ("missingatsign.com", False),
+        ("missingdomain@.com", False),
+        ("missingdot@domaincom", False),
+        ("valid.email+alias@gmail.com", True),
+        ("email@sub.domain.com", True),
+    ],
+)
+def test_is_valid_email(email: str, expected: bool) -> None:
+    assert is_valid_email(email) == expected
+
+
+if __name__ == "__main__":
+    pytest.main()
diff --git a/.vscode/settings.json b/.vscode/settings.json
index b197524..a789f40 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -18,13 +18,13 @@
   "python.linting.enabled": false,
   "ruff.organizeImports": true,
   "ruff.fixAll": true,
-  "ruff.lint.args": [
-    "--config",
-    "pyproject.toml"
-  ],
+  "ruff.lint.args": ["--config", "pyproject.toml"],
   "ruff.lint.enable": false,
-  "ruff.format.args": [
-    "--config",
-    "pyproject.toml"
+  "ruff.format.args": ["--config", "pyproject.toml"],
+  "github.copilot.chat.experimental.codeFeedback.instructions": [
+    { "file": ".github/copilot-feedback-instructions.md" }
+  ],
+  "github.copilot.chat.experimental.codeGeneration.instructions": [
+    { "file": ".github/copilot-generation-instructions.md" }
   ]
 }
diff --git a/src/profiling/primes.py b/src/profiling/primes.py
index 0705573..85fe585 100644
--- a/src/profiling/primes.py
+++ b/src/profiling/primes.py
@@ -14,7 +14,12 @@ def _slow_sort(arr):
     return arr
 
 
+def _fast_sort(arr):
+    return sorted(arr)
+
+
 def sort(*args, **kwargs):
+    return _fast_sort(*args, **kwargs)
     return _slow_sort(*args, **kwargs)
 
 
@@ -28,8 +33,17 @@ def _slow_prime_check(n):
     return True
 
 
+def _faster_prime_check(n):
+    if n < 2:
+        return False
+    for i in range(2, int(n**0.5) + 1):
+        if n % i == 0:
+            return False
+    return True
+
+
 def prime_check(*args, **kwargs):
-    return _slow_prime_check(*args, **kwargs)
+    return _faster_prime_check(*args, **kwargs)
 
 
 def _slow_make_unique(data):
@@ -50,8 +64,15 @@ def _slow_save_items(results, file_name):
             f.write(str(item) + "\n")
 
 
+def _fast_save_items(results, file_name):
+    with open(file_name, "a") as f:
+        for item in results:
+            f.write(str(item) + "\n")
+
+
 def save_items(*args, **kwargs):
-    return _slow_save_items(*args, **kwargs)
+    return _fast_save_items(*args, **kwargs)
+    # return _slow_save_items(*args, **kwargs)
 
 
 def process_data(data):
diff --git a/src/profiling/primes_faster.py b/src/profiling/primes_faster.py
new file mode 100644
index 0000000..ffba5f4
--- /dev/null
+++ b/src/profiling/primes_faster.py
@@ -0,0 +1,106 @@
+import random
+import time
+
+RESULTS_FILE_NAME = "_results.txt"
+UNIQUE_RESULTS_FILE_NAME = "_unique_results.txt"
+
+
+def _slow_sort(arr):
+    n = len(arr)
+    for i in range(n):
+        for j in range(0, n - i - 1):  # noqa: PIE808
+            if arr[j] > arr[j + 1]:
+                arr[j], arr[j + 1] = arr[j + 1], arr[j]
+    return arr
+
+
+def sort(*args, **kwargs):
+    return sorted(*args, **kwargs)
+
+
+def _slow_prime_check(n):
+    if n < 2:
+        return False
+    for i in range(2, int(n**0.5) + 1):
+        if n % i == 0:
+            return False
+    time.sleep(0.01)  # Simulate slow computation
+    return True
+
+
+def _fast_prime_check(n):
+    """Check if a number is prime."""
+
+    if n < 2:
+        return False
+    for i in range(2, int(n**0.5) + 1):  # noqa: SIM110
+        if n % i == 0:
+            return False
+    return True
+
+
+def prime_check(*args, **kwargs):
+    return _fast_prime_check(*args, **kwargs)
+
+
+def _fast_make_unique(data):
+    return list(set(data))
+
+
+def make_unique(*args, **kwargs):
+    return _fast_make_unique(*args, **kwargs)
+
+
+def _slow_save_items(results, file_name):
+    for item in results:
+        with open(file_name, "a") as f:
+            f.write(str(item) + "\n")
+
+
+def _fast_save_items(results, file_name):
+    with open(file_name, "a") as f:
+        for result in results:
+            f.write(str(result) + "\n")
+
+
+def save_items(*args, **kwargs):
+    return _fast_save_items(*args, **kwargs)
+
+
+def process_data(data):
+    primes = []
+    result = []
+    for item in data:
+        if prime_check(item):
+            result.append(f"* {str(item).rjust(6)} is prime")
+            primes.append(item)
+        else:
+            result.append(f"  {str(item).rjust(6)}")
+
+    save_items(result, file_name=RESULTS_FILE_NAME)
+    save_items(make_unique(sort(primes)), file_name=UNIQUE_RESULTS_FILE_NAME)
+
+    return result
+
+
+def main():
+    with open(RESULTS_FILE_NAME, "w") as f:
+        f.write("")
+    with open(UNIQUE_RESULTS_FILE_NAME, "w") as f:
+        f.write("")
+
+    number = 1000
+    data = [random.randint(1, number) for _ in range(number)]  # noqa: S311
+
+    start_time = time.time()
+
+    sorted_data = sort(data)
+    processed_data = process_data(sorted_data)  # noqa: F841
+
+    end_time = time.time()
+
+    print(f"Time taken: {end_time - start_time:.2f}s")
+
+
+if __name__ == "__main__":
+    main()