3/5 (For Old Versions) | 1/5 (For Modern Versions)
Older versions (particularly the v2.x series) were famous for their tiny file size (often under 1MB) and incredibly low RAM usage. They could run on ancient hardware without the user even noticing a slowdown. Modern versions are resource-heavy by comparison.
Older versions lack security patches (e.g., fixes for DPI bypass vulnerabilities, protocol updates, SSL certificate updates). Use them only in isolated/test environments or offline LANs, not on modern internet-exposed systems.