TLDR (from article)<p>But now that we are seeing these slightly bigger blocks, claims are being made that segwit’s method of increasing capacity is actually very inefficient.<p>In comparing some numbers the 1.6MB block had:<p><pre><code> Block size: 1602023
Number of transactions: 833
Input count + Output count: 11073
Bytes per IO address: 144
</code></pre>
While a random non-segwit block (483,182) had:<p><pre><code> Block size: 999931
Number of transactions: 2110
Input count + Output count: 10574
Bytes per IO address: 95
</code></pre>
The segwit block, therefore, which is near the practical limit of bitcoin’s current blocksize rules, was able to handle only 500 more inputs and outputs out of some 11,000. Making it an increase of just 5%, instead of 50% as would be the case for a non-segwit 1.6MB block.