I2Speed Technical Overview

• Math libraries on the Mac and on Linux X86_64 were built using latest GMP 6.2.0 and latest compilers. Support for Skylake and Nehalem architectures on the Mac added. 32-bit support and debug stuff stripped from all Mac components.
• Do not fall back to short encrytion keys when using ARM64 quadcore oder ARM32 8-core.
  
• Pre-generation of random numbers and crypto keys is now evenly distributed over time. Now it is made sure that buffers do not run dry under high load, delaying packets by on-the-fly generation. Makes processing of local traffic 25% faster under high load. There even is an auto-turbo mode geared towards massively parallel ARM-boards.
• Ultrafast lockless operation for many queues, caches and popular random number types.
  
• All message processing is done in parallized threads, was mostly sequential before.
  
• Numerous tweaks to the NTCP transport to cut out some ms latency.
• Several improvements to the multi-threaded design. Threads along with context switches eliminated where easily possible. Thread count scales to platform, processor count and type. Threads wait more than 50% less idle on the run queue (Linux).
• UDP send strategy employs parallel resends and a very fastly tuned send window, aimed at minimizing message loss on failing connections. Tolerates high levels of packet loss (limit 5% for fast connections, more when slower). Helps with WiFi and when running high bandwidth. Top speeds averaging > 200 KBps (single connection) outperforming TCP.
• excessive locking resolved within the UDP transport, cutting down noticably on CPU.
• resolved high frequency of iterations over UDP messages in transit. During lifetime the average message is visited < 10 times versus > 1,000 times before. Clear CPU reduction.
• Once a message gets in over UDP it is reliably ACKed twice. Saves 1% inbound bandwidth by bringing the duplicates received down to near zero. The real winner here is the avoidance of connection stalls on the remote end. If network is correctly configured, UDP will account for around 80% of inbound traffic.
  
• High frequency of calls to the system clock eliminated. Clear CPU reduction.
• Chooses among twice as many network peers when building tunnels. Useful if you run 100s of local tunnels as we do.
  
• Lossless compression for graphics cutting down 28% average on memory usage.