The phrase "are almost optimal" is correct and usable in written English.
It can be used when discussing solutions, strategies, or methods that are very close to the best possible outcome but not quite there.
Example: "The current algorithms we are using are almost optimal, but there is still room for improvement."
Alternatives: "are nearly optimal" or "are close to optimal."
We prove that, under a weak assumption on the content popularity distribution, choosing smaller chunks allows to improve the performance of chunk-LRU policy, and we show numerically that even for a small number of chunks, the gains of chunk-LRU are almost optimal.
In [10] the authors showed that the Berestycki-Lions conditions are almost optimal if f is of subcritical growth.
We note that, for low AS values, the JE NRMSEs are almost optimal, since they coincide with the CRLB.
In their theoretical analysis of this behavioral data, Feng et.al. [14] found that monkeys are almost optimal in their use of reward information to bias their decisions about uncertain stimulus information.
In practice, such an estimator design is either assumed to be almost optimal for window- and stability-time errors or a cumbersome simulation-based optimization is conducted to achieve optimality in this respect.
In this case, the new algorithm is almost optimal.
Numerical convergence rates are given to show that the LSFEM is almost optimal.
GAZETTE: The Manhattan block length, which was laid out in 1811, has turned out to be almost optimal for pedestrian accessibility today.
Furthermore, it is almost optimal for a class of moderately soft potentials, that is for a moderate singularity.
On the positive side, we present an algorithm for finding a subnetwork that is almost optimal with respect to the bottleneck cost of its worst Nash flow, when the worst Nash flow in the best subnetwork routes a non-negligible amount of flow on all used edges.
Until AC was developed in the 1970s, Huffman coding was considered to be almost optimal.
